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History and current status of systematic research with araceae


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REGIONAL STUDIES WITH ARACEAE



ASIA
Among the earliest who described and often illustrated Araceae in Asia were the Dutchmen, H. A. van Rheede tot Drakestein (1688, 1692), who did massive studies of the Malabar coast of India; P. Hermann (1689), who produced the Paradisus Batavus; and G. E. Rumphius (1747), who studied the flora of the island of Amboina [one of the Mollucas Islands, now Maluku in Indonesia]. Another Dutch botanist, N. L. Burmann (1768), published Araceae in his Flora Indica, and C. L. Blume dealt extensively with Malesian Araceae (Blume, 1836-1837). Another early botanist who described and illustrated Araceae in Malesia was the Italian, Odoardo Beccari (Beccari, 1879, 1882, 1889; Engler, 1879b).
Many of the species in Asia were described by regional workers doing floristic studies on particular regions. Except for Japan the earliest workers with aroids in Asia were generally not natives but were primarily botanists from colonial powers working in their own sphere of influence. In the Dutch East Indies it was primarily the Dutch. Other botanists who were describing Araceae from the Dutch East Indies included the Britian, R. Brown (1810), the German, J. C. Hasskarl (Hasskarl, 1842), and Dutch botanists, J. E. Teijsmann (Teijsmann & Binnendijk, 1862), F. A. W. Miquel (Miquel, 1855-1856, 1856, 1860, 1864, 1867), Hans Hallier (1898, 1901, 1915), C. R. W. K. van Alderwerelt van Rosenburgh, thankfully abbreviated "Alderw." (Alderwerelt van Rosenburgh, 1920, 1922a, 1922b), and C. A. Backer (Backer, 1913a, 1913b, 1913c, 1914, 1920, 1928).
In Indochina, it was a Portuguese naturalist Joao Loureiro who published his Flora Cochinchinensis (1790) and the Frenchman, F. R. Gagnepain, who wrote the Araceae treatment for Lecomte's Flore général de l'Indochine (Gagnepain, 1942a) and other works describing new genera and species (Gagnepain, 1941a-c).
In the Malay Peninsula it was H. N. Ridley, Director of the Singapore Botanical Garden from 1888 to 1912 (Ridley, 1908, 1916, 1922, 1938), and C. X. Furtado (Furtado, 1930, 1935, 1939, 1941, 1958, 1964a, 1964b), also from Singapore who described Araceae in the area.
In the Philippines it was the Spaniard, F. M. Blanco (1837) and Americans, E. D. Merrill (1912, 1915, 1916a, 1916b, 1917, 1918, 1919, 1921b, 1923, 1924, 1925, 1926, 1932, 1935b, 1937, 1948, 1949, 1952) and A. D. E. Elmer (1919, 1938, 1939). Merrill also described species from Guam (Merrill, 1914), Borneo (Merrill, 1921a, 1922a, 1929); Sarawak (Merrill, 1922b, 1928, 1934a) and Hainan in China (Merrill, 1927, 1930a, 1930b; Merrill & Metcalf, 1945), Sumatra (Merrill, 1933) and Vietnam (Merrill, 1942).
In Malesia, much of the recent work with the flora was organized by C. G. G. J. van Steenis who began the Flora Malesiana project as a resident in Asia for much of his lifetime. Most of his studies were carried out on Java (van Steenis, 1948a, 1948c, 1949, 1965a, 1965b, 1972, 1975). Despite the fact that some of the earlier European workers, including Ridley and van Steenis, spent considerable portions of their lives in Asia the majority of the Asian species were described in the European centers of botany, in Paris, Brussels, Leiden, Berlin, and Kew.
At Kew, the role of describing Araceae was first played by William J. Hooker and his son Joseph D. Hooker (J. Hooker, 1883, 1904), the first two directors, and later by N. E. Brown (Brown, 1901) and to a lesser extent by M. T. Masters (1873, 1876, 1878, 1884, 1893a, 1893b, 1898). The elder Hooker played only a minor role dealing directly with Araceae but did publish a number of short papers in Curtis's Botanical Magazine. These dealt with Alocasia (W. Hooker, 1860b, 1863), Amorphophallus (W. Hooker, 1860a), Arum (W. Hooker, 1828), and Pistia (W. Hooker, 1851). J. D. Hooker dealt more extensively with Araceae. He was responsible for the treatment of the Araceae in Bentham & Hooker's Genera Plantarum (J. Hooker, 1883c), a treatment largely based on that of Schott. He also described many species of Araceae as well as the genus Gonatopus. Many of his new species were described in his Flora of British India (J. Hooker, 1893). J. D. Hooker also treated many species in great detail in Curtis's Botanical Magazine, including Aglaonema (J. Hooker, 1865b), Alocasia (J. Hooker, 1865a, 1896), Amorphophallus (J. Hooker, 1888, 1891a, 1893b), Arisaema (J. Hooker, 1890a, 1890b, 1891b), Colocasia (J. Hooker, 1894), Cryptocoryne (J. Hooker, 1900), Culcasia (J. Hooker, 1869 [described as Aglaonema]), Hapaline (J. Hooker, 1893a), Lysichiton (J. Hooker, 1904), Piptospatha (J. Hooker, 1881b, 1895), Schismatoglottis (J. Hooker, 1881a), and Typhonium (J. Hooker, 1875).
Many other floristic studies, both regional and general, throughout many years have contributed to the generally high levels of knowledge about Asian plants. Owing to the early English involvement, many of the early floristic studies were made on the Indian subcontinent, including those in W. Roxburgh's Flora Indica (Roxburgh, 1820b, 1832) and in Hortus Bengalensis (Roxburgh, 1814) which cataloged the holdings of the East India Company's living collection in Calcutta. Other early works include those by the German A. W. Roth (1821) and the Dane N. Wallich (1830, 1831). Still other general works on India include those by Burkill (1925), Suresh et al. (1983) and Zhongguo (1994). Works dealing with specific parts of India include that for the Coromandel Coast [SE India] (Roxburgh, 1820a); Assam, South India (Rao & Verma, 1968, 1976; Barnes & Fischer, 1936a); the Calicut area (western sectors of Calicut and Malappuram Districts) (Manilal & Sivarajan, 1982); the Presidency of Madras (Fischer, 1931); the Howrah District (Bennet, 1979); the Presidency of Bombay (Cooke, 1906; Blatter & McCann, 1931); Nainital in Uttar Pradesh (Gupta, 1968), the Bashahr Himalayas (Nair, 1977); Manipur State [NE India] (H. Singh, 1993), the Chikihagular District, Karnataka, India (Bhat, 1993; Yoganarasimhan et al., 1981); as well as of Majuli (Islam, 1990); Punjab (Sharma, 1990), Andaman and Nicobar Islands (Kurz, 1893; Srivastava & Kumar, 1993), Barren Island (Prain, 1893) and the Kolhapur District in Maharashtra State written by Indian Araceae expert S. R. Yadav and his colleague M. M. Sardesai (both from Shivaji University in Kolhapur District). C. Fischer published a series of papers during the 1930s dealing with Indian Araceae (Fischer, 1931, 1933, 1934, 1936a, 1936b, 1939) and F. Baius (1936) wrote on the medicinal and poisonous aroids of India. New species of Arisaema (Rao & Srivastava, 1991; Yadav et al. 1993) have been recently described from India (see also Sivadasan below).
Studies of Araceae in non-Indian areas on the Indian subcontinent include those in West Pakistan (Nasir, 1978); Bangladesh (Khan & Halim, 1987); Bhutan (Noltie, 1994); Nepal (Wallich, 1824); Hara, 1978); Himalayas (Polunin & Stainton, 1984) and Eastern Himalaya (Hara, 1966). Araceae studies in areas adjacent to India include those in Ceylon (Thwaites, 1864; Trimen, 1898; Alston, 1931) and Burma (Kurz, 1873).
Elsewhere in Southeast Asia studies were made in Thailand (Ridley, 1911a; Craib, 1912, 1913; Hu, 1968; Suvatti, 1978) and the Malay Peninsula including West Malesia (Jack, 1820; Burkill & Holttum, 1923; Ridley, 1885, 1893, 1902, 1904, 1907a, 1907b, 1909, 1910; 1911a, 1911b, 1912, 1925a; Rendle, 1924-1925; Henderson, 1926, 1927, 1928, 1939, 1954; Merrill, 1952; Chin, 1982; van Steenis-Kruseman, 1963, 1966, 1975); Malaya [Perak] (Hemsley, 1887); Malaya (Johore) & Singapore (Corner, 1978); [Pahang, Gunung Ulu Kali] (Stone, 1981); Singapore (Ridley, 1900). Studies in Indochina were those by Gagnepain (1942a) and by Merrill (1935a); others were in Vietnam (Pham Hoàng Hô, 1960; Thin, 1997). Other studies were made in Borneo (Rendle, 1901; Ridley, 1905, 1913, 1914; Gibbs, 1914; Masamune, 1942); Sabah (Stapf, 1894); and Sarawak and Brunei (Anderson, 1963; Wong, 1990).
Additional works from the Dutch East Indies and vicinity included works by the following: de Vriese (1851); Miquel (1855–1856, 1956a, 1956b, 1860, 1864, 1867); Zollinger (1845, 1854, 1857); Soepadmo (1977); van Steenis (1949); other areas mostly Indonesia (Java, Sumatra, Celebes, Borneo, New Guinea and rarely the Philippines) by Alderwerelt van Rosenburgh (1920, 1922a, 1922b); Java (Thunberg, 1825; Hasskarl, 1842a, 1842b, 1844, 1848; Koorders, 1901a, 1901b, 1911, 1918a, 1918b, 1923; Backer, 1913a-c, 1914, 1920, 1928; Backer & Bakhuizen, 1968; Backer et al., 1950; Bakhuizen v.d. Brink, 1957, 1963); Sumatra (Hotta, 1984; Ridley, 1917, 1923, 1925a, 1925b); Celebes (Koorders, 1898, 1922b; Kawakami, 1912); Tjibodas [Indonesia] (Koorders, 1922); Amboina [Indonesia] (Rumphius, 1747, 1750); Bangka (Kurz, 1864); Talaud Islands [Indonesia] (Holthuis & Lam, 1942) and Mentawi Islands [Indonesia] (Ridley, 1926), and finally Christmas Island [a British island south and west end of Java] (Rendle, 1900; Ridley, 1906).
Works in New Guinea included: (Ridley, 1886; Schumann & Hollrung, 1889; Schumann & Lauterbach, 1905; Engler, 1907, 1911; Engler & Krause, 1911; Rechinger, 1913; Ridley, 1916; Rendle, 1923; Borrell, 1989); Papua New Guinea (Gilli, 1980; Lane-Poole, 1925; Mueller, 1876b; Schumann, 1887; Warburg, 1891; White, 1922; White & Francis, 1927); Dutch New Guinea (Gibbs, 1917); Bismarck Archipelago [Papua New Guinea] (Peekel, 1984) including New Ireland (Lauterbach, 1911) and New Britain (Schumann, 1898), and Kairiru Island [New Guinea] (Borrell, 1989).
In the Philippines works included are those by: Usteri (1905); Brown (1919); Quisumbing & Merrill (1928); Pancho (1959); and Hatusima (1966). [See also papers by E. D. Merrill and A. Elmer cited above].
In northern Asia studies were made in China (Li et al., 1977); southwestern China (Handel-Mazzetti, 1936; Wu & Li, 1979); Hainan Province (Chun et al., 1977), the Dulongjian region (Li, 1993b); Taiwan (Hayata, 1915, 1916, 1919, 1920; Liu & Chen, 1984; Liu & Huang, 1963, 1977; Huang, 1960, 1979, 1982, 2000; Masamune, 1943); Botel Tobago [ca. 75 km SE of Taiwan] (J. P. Hernández, 2002[2003]) and Korea (Lee, 1976; Lee, 1985). [See also the contributions by Merrill elsewhere.] In Japan most species of Araceae were described by T. Makino (1892, 1893, 1901a, 1901b, 1910a, 1910b, 1911, 1913, 1918a, 1918b, 1928, 1931, 1932, 1960, 1961) and T. Nakai (1917, 1918, 1928, 1929, 1931, 1934, 1935a-d, 1937a, 1937b, 1938, 1939a-c, 1940a-d, 1943). Other works from Japan included those by M. Honda (1939), S. Kitamura et al. (1977); G. Koidzumi (1928), T. Koyama (1965), J. Ohwi (1953, 1965), J. Ohashi (1982), and H. Tanaka (2004). Another dealt with Okinawa and the southern Ryukyu Islands (Walker et al., 1976).
Floristic works and miscellaneous papers on Araceae in Australia include: general areas (Brown, 1810; Mueller, 1858, 1874, 1876a, Bentham, 1878; Maiden, 1889, 1905; Domin, 1911, 1915; Green et al., 1994; Jones et al., 1977; Pate & Dixon, 1982; Elliot & Jones, 1982, 1984, 1990; Morley, 1983; Jones et al., 1977; Jones & Gray, 1988, Briggs & Leigh, 1988; Hnatiuk, 1990; Hay, 1989, 1992a, 1993a, 1993b, 1995); Queensland (Bailey, 1883, 1891, 1897, 1902, 1913, 1914; Orsino & Dameri, 1992; Williams, 1979); New South Wales (Moore & Betchie, 1893; Dixon, 1908; Evans, 1961, 1962; Hay, 1993c), Lord Howe Island (Oliver, 1916), Sydney region of New South Wales (Beadle et al., 1963, 1982; Beadle, 1987); Carolin & Tindale, (1993); Victoria (Ewart, 1930; Willis, 1962); Central Australia (Jessop, 1981); South Australia (Black, 1909, 1943, 1978, 1986; Eichler, 1965; Jessop, 1986); Western Australia (Gardner, 1931); Kimberley region [Western Australia] (Rye, 1992); Northern Territory (Ewart & Davies, 1917; Blake, 1954; Lazarides et al., 1988); Cocos Islands [north of Australia] (Prain, 1891); and Norfolk Island (Maiden, 1903).
The region of Oceania, though not rich in Araceae, has been well studied from the standpoint of aroid floristics. Among the earliest studies made in the region was that by J. G. A. Forster (1786) who made a floristic study of the so-called Australian Islands (Southern Islands, i.e. New Zealand, New Caledonia, and many of the smaller Oceanic islands. Still another early study was that by B. C. Seemann (1868, 1869a, 1869b) on Fiji. Other studies in the Oceanic region included that on the Samoan Islands (Christophersen, 1935; Reinecke, 1898); Rarotonga [Cook Islands] (Wilder, 1931); the southeastern Moluccas (Hemsley, 1885b); Ryukyu Islands (Hatusima, 1962); Micronesian Islands (Koidzumi, 1916; Hosokawa, 1937; Hatusima, 1939; Kanehira, 1933, 1935); Makatea (Wilder, 1934); Guam (Safford, 1905; Stone, 1964); Tonga Islands (Hemsley, 1893; Yuncker, 1959; Hotta, 1963a; Whistler, 1991); Christmas Island (Rendle, 1900; Ridley, 1906); Niue [New Zealand] (Yuncker, 1943; Sykes, 1970); Kermadec [New Zealand] (Sykes, 1977; Parham, 1972), Ponape [Caroline Islands] (Glassman, 1952), New Hebrides (Guillaumin, 1932, 1938), and New Caledonia (Guillaumin, 1937, 1943, 1947, 1948, 1962; Rendle, 1921).
In contrast to much of Asia, the Japanese have largely studied their flora. Local Japanese botanists who made great contributions to the understanding of the Araceae include Tomitaro Makino (1862-1957) and Takenoshin Nakai (1882-1952) from the University of Tokyo and Director of the National Science Museum. Nakai described most species, mostly species of Arisaema and he also published a new system of classification (Nakai, 1943) that excluded a few long-standing genera of Araceae, incorporating them into their own families, Pistiaceae, Cryptocorynaceae, and Acoraceae (only the latter is still excluded from the Araceae). Nakai's students, Fumio Maekawa and Hiroshi Hara, were also very much interested in Araceae, especially Arisaema. Maekawa (1924, 1932, 1934, 1936, 1937) described new species from Japan. Hara described new species of Arisaema (Hara, 1935a, 1935b, 1961, 1965; Hara & Ohashi, 1973) and made critical revisions for the Flora of the Eastern Himalaya (Hara, 1966, 1971a). Later he proposed an infrageneric system of classification for the genus Arisaema (Hara, 1971b), a system since adopted by Wu Cheng Yih and Li Heng (1979) and recently revised by Jin Murata (1984). A later paper described additional species from Himalaya (Hara, 1973).
Another Japanese botanist, Shiro Kitamura, working about the same time as Hara, published several significant papers on Araceae of Japan (Kitamura, 1941, 1949; and compiled Coloured Illustrations of Herbaceous Plants of Japan (Kitamura et al., 1977) that contains line drawings and paintings of Araceae.

AFRICA
Most floristic projects on the continent were initiated by the colonial powers, including Belgium and Germany, and especially Britian and France. In general, the Araceae treatments were completed by botanists who were competent researchers but not formally trained aroid specialists. One such botanist was F. N. Hepper, who contributed the Araceae treatment for the Flora of West Tropical Africa (Hepper, 1968a-c). Hepper's treatment of the Araceae for that flora [a revision of an earlier flora by the same name (Hutchinson & Dalziel, 1936)] is a remarkably good one. His understanding of the genus Culcasia (Hepper, 1965, 1967), probably the most complex genus in Africa, was particularly good. An exception to the rule that most flora writers were non-aroid specialists might be N. E. Brown who prepared the Araceae treatment for the Flora of Tropical Africa (Brown, 1901). Other publications that contributed to the generally high level of knowledge about African flora include some generic studies for the entire continent (Thonner, 1915), South Africa (Dyer, 1976), and Central Africa (Bamps, 1982; Malaisse & Bamps, 1993). Other publications include general floristic studies in the Mascarene Islands (Mayo, 1983b), German East Africa (or Tanganyika and now mostly Tanzania) (Mildbraed, 1936; Peter, 1929), Belgian Congo (Katanga) [until recently Zaire and now Congo] (Wildeman, 1921, 1922), Senegal (Lykke, 1994), as well as Egypt and western Asia (Boisser, 1884) and Ghana (Beath, 1993). Papers focusing mainly on African species include those on Zantedeschia (Letty, 1973; Perry, 1989), Zamioculcas (Obermeyer & Strey, 1969); Stylochaeton (Malaisse & Bamps, 1994); Remusatia (Robyns, 1931), Gonatopus (Obermeyer 1977; Obermeyer & Bogner, 1979), and Amorphophallus (Ittenbach, 2003). A recent paper ennumerates species of Araceae in 30 genera (including introduced genera) from tropical West Africa (Lebrun & Stork, 1995). [See also Ntépe-Nyame and Knecht, below.]
Madagascar was a special interest of Samuel Buchet (Bogner, 1980g), a French botanist who described Arisaema and Pothos species from Asia (Buchet, 1911a, 1911b) and studied the Arophyteae (Buchet, 1939a, 1942), the dominant element of the Malagasy flora. Josef Bogner (see below) has had the greatest impact on the study of Araceae in Madagascar. The Seychelles near Madagascar also has an interesting flora and the island is important as having the endemic genus Protarum (Robertson, 1989).
AMERICA
In contrast to Africa and Asia where there were strong botanical interests within the colonial powers, the neotropics had little early exploration and very few floristic projects. Neither Spain nor Portugal made much headway towards the production of floras nor did they even launch major collecting programs. Exceptions were the expeditions of Sesse & Moçino, Ruiz & Pavon, and Triana & Planchon, but they collected few specimens of Araceae.
Regardless of their origin, most 18th and 19th Century botanists collected and described relatively few Araceae, though some are worthy of mention. E. F. Poeppig collected and described a number of important species of Araceae from Peru and Brazil (Poeppig, 1845). Also important was A. F. M. Glaziou and H. W. Schott, both working in Brazil. While Glaziou collected many species described by Schott and others he did not publish any species himself. F. A. W. Miquel collected important Araceae in the Guianas, as did R. Spruce in the Amazon basin (though the latter did not publish any new species). Aside from Luis Sodiro, who collected Araceae in Ecuador [see Sodiro above], most of the other important collectors of Araceae in the 19th Century did not publish on Araceae. These included F. Lehmann, collecting in the western Andes of Colombia and Ecuador, E. Ule in the upper Amazon basin, as well as August Fendler and H. Pittier collecting in Venezuela.
With the notable exception of J. M. da Conceiçao Vellozo (1742-1811) who published Araceae in his Flora Fluminensis (Vellozo, 1825(1829), 1831a, 1831b) few early Portuguese or Spanish described Araceae [see Stellfeld, 1950 for an account of the work of Vellozo]. With the minor exceptions of M. S. Bertoni (Paraguay), G. M. Barroso, specializing on Araceae at the Rio de Janiero Botanical Garden, and P. R. Reitz, also from Brazil and working on the Aráceas Catarinensis (Reitz, 1957), few Araceae were described by native-born Latin Americans. In Latin America as in Asia, the new species were in part described by the flora writers from other countries or by plant explorers such as Europeans N. J. Jacquin, F. A. W. Miquel, and others. The works of Jacquin (1760, 1763, 1772, 1790a, 1790b, 1797) based on his travels in the West Indies are important because he was one of the first to describe Araceae from the New World. His colored paintings in Icones Plantarum Rariorum (Jacquin, 1790a) are particularly noteworthy. John G. Baker described and illustrated a number of Araceae, especially Anthurium in Saunder's Refugium Botanicum (Baker, 1871). S. L. Moore included Araceae in his studies of the plants of Mato Grosso in Brazil (Moore, 1895).
During the 20th Century, American institutions began serious studies in Latin America and authors such as P. C. Standley, who wrote a series of floras in Central America, and J. F. Macbride, who worked on the Flora of Peru, described a number of new species. In addition, small but important collections were described from Colombia by R. E. Schultes during his ethnobotanical studies of the neotropics and L. Diels (1937a, 1937b), working at the Berlin Botanical Garden, described collections made in Ecuador. The Dutch under Pulle also started a flora in Suriname, then a Dutch territory. Floristic studies did not play as great a role in the Americas as they did in Asia and Africa; however, a number were done. For South America these include: Argentina (Crisci, 1971; Crisci & Katinas, 1999; Hauman & Vanderveken, 1917); Buenos Aires Province (Crisci, 1968a); Bolivia (Rusby, 1910, 1927); Brazil (Engler in Martius, 1878a; Stellfeld, 1950), Amazonas (Smith, 1939), Bahía (Harley & Mayo, 1980); Rio Grande do Sul State (Rambo, 1950), Rio de Janiero State (Casiri, 1982); Cardoso Island (Olaio & Catharino, 1991); Colombia (Garcia-Barriga, 1974; Escobar, 2001; Forero & Gentry, 1989; Gines et al., 1953; Galeano & Bernal, 1993); Ecuador (Dodson & Gentry, 1978; Dodson et al., 1985); French Guiana (Aublet, 1775; Lemée, 1955; Croat, 1995b); Guyana (British Guiana) (Gleason, 1929; Graham, 1934); Paraguay (Bertoni, 1916; Chodat & Hassler, 1903; Chodat & Vischer, 1919; Croat & Mount, 1988); Peru (Macbride, 1936); Surinam [see Jonker-Verhoef & Jonker below]; Uruguay (Herter, 1943; Marchesi, 1984); and Venezuela (Pittier et al., 1945; Maguire, 1948; Steyermark, 1951; Steyermark & Huber, 1978; Bunting, 1995; Gines et al., 1953).
The earliest effort to produce a flora from Central America was that by William Botting Hemsley (Hemsley, 1885a). Other floristic works done later include those by: L. O. Williams (1981) in Central America; I. Johnston (1949), F. Liebmann (1849), C. L. Lundell (1937, 1939, 1941), R. McVaugh (1993), M. Martínez & E. Matuda (1979), and Espejo Serna & Lopez Ferrari (1993) in Mexico; McVaugh (1993) and Vásquez et al. (1995) in western Mexico; H. H. Bartlett (1937) in Petén Province, Guatemala; T. K. Yuncker (1940) and A. Molina (1975) in Honduras; D. L. Spellman et al., (1975) in Belize; Engler (1900) in Costa Rica, and Paul Standley (see Standley below) in various other countries.
In the West Indies, floristic studies have been numerous and this area was one of the first to be explored by collectors such as C. Plumier, H. Sloane, N. J. Jacquin, and others. In fact, many of the earliest names of New World plants are based on West Indian types. General floristic accounts include: the Dutch Antilles (Arnoldo, 1971; Boldingh, 1913); Jamaica (Adams, 1972; Proctor, 1982); Cayman Islands (Proctor, 1984); Cuba (Grisebach, 1864, 1866; Sauvelle, 1868; Leon, 1946); Haiti (Barker & Dardeau, 1930; Liogier, 1981); Dominican Republic (Moscoso, 1943; Hodge, 1954a); Puerto Rico (Liogier, 1965; Liogier & Martorell, 1982); Puerto Rico and the Virgin Islands (Britton & Wilson, 1923, 1926; Acevedo-Rodríguez, 1966); the Windward and the Leeward Islands (Beard, 1949); Barbados (Gooding et al., 1965); Guadeloupe and Martinique (Heckel, 1897); and Lesser Antilles (Howard, 1979).
1920–1950: A DERTH OF ARACEAE RESEARCH
Only a few of the earlier above mentioned non-specialists and flora writers did specialized research with Araceae during the three decades following the completion of Engler's treatment of the family in Das Pflanzenreich (Engler, 1905a, 1911, 1912, 1915, 1920a-c). A few floristic projects in the neotropics were pursued, such as the Araceae treatment for the Flora of Peru (Macbride, 1936) and various floristic projects by Paul Standley in Central America. Perhaps the lack of monographic research was due to the disruption caused by two World Wars and a major worldwide depression, or to the mistaken belief that the Das Pflanzenreich treatment was a complete revision of all the species that existed. However, there are exceptions to this ebb in specialized research activity during the 1920s through the 1940s. For example, there was research with leaf architecture by the German botanist P. Ottmar Ertl (1932). This work detailed petiolar anatomy, blade shape, and included an analysis of venation in many different genera of Araceae. Other general publications dealt with chromosomes in Anthurium by Lulu O. Gaiser (Gaiser, 1927, 1930) and other miscellaneous genera (Jussen, 1928; Ito, 1942).
The French botanist, Samuel Buchet, published several papers dealing with the systematics of the Araceae between 1920 and 1939 (Buchet, 1939a, 1939b, 1942; Buchet & Guillaumin, 1939). He published new plant species descriptions from Asia and especially from Madagascar. Another Frenchman, H. Jumelle, also worked on the plants of Madagascar (Jumelle, 1919, 1928). Still another French botanist, A. Chevalier, published a few papers on Araceae during the same era. These dealt with aquarium plants, Cryptocoryne (Chevalier, 1934a, 1934b), and Cercestis in West Africa (Chevalier, 1920). In the late 1940s and early 1950s the Indian botanist, D. Chatterjee, published new species of Arisaema from Burma, India, and Sikkim (Chatterjee, 1949, 1955).
MATUDA
Although botany languished to some extent in other parts of the world due to the influence of World War II, there was a renewed interest in research in the Western Hemisphere after the war. The first signs of renewed research activity was with the Araceae in Mexico. Eizi Matuda, a native of Nagasaki, Japan but a naturalized Mexican citizen since 1928 (arriving in 1922), worked extensively on Araceae in the 1950s. Matuda was a field man and traveled into remote areas by mule, thus acquiring an excellent knowledge of much of tropical Mexico. His descriptions, though relatively detailed, do not compare with those of Sodiro. Matuda's first papers published a new species of Dracontium (Matuda, 1949) as well as one of Monstera and Philodendron (Matuda, 1949a). These were followed by floristic accounts of particular regions including Mount Ovando (Matuda, 1950a), the districts of Soconusco and Mariscal (Matuda, 1950b), and the state of Mexico (Matuda, 1957a). Miscellaneous new Mexican species were described in nearly all Mexican genera of Araceae throughout his career (Matuda, 1950c, 1950d, 1951, 1952, 1956a, 1956b, 1957b, 1959a, 1959b, 1961a, 1961b, 1965, 1966, 1972, 1975). In all, Matuda described more than 50 species of Araceae, all from Mexico. His most useful work is a treatment of the Araceae of Mexico, which includes both dichotomous keys and descriptions (Matuda, 1954).
FLORISTIC WORK IN SOUTH AMERICA
During the time that Matuda was collecting and describing plants in Mexico, Richard Evans Schultes, a non-aroid specialist, was collecting and describing new species in conjunction with his ethnobotanical studies in South America, especially Amazonian Colombia. His ethnobotanical findings are summarized in a book (Schultes & Raffauf, 1990). In all, Schultes described about 20 species. Many of these remain accepted names (Schultes, 1953, 1954, 1958, 1959, 1963, 1964a, 1964b; Schultes et al., 1978, 1994).
At about the same time, Basset Maguire from the New York Botanical Garden discovered new species during his expeditions to the Guayana Highlands (Maguire, 1948). Among those participating in his expeditions were George Bunting and Julian Steyermark. Some new species were named independently by Steyermark or Bunting, but some were also described by Alex D. Hawkes, a Californian. Though some of the species that Hawkes described proved to be new, he frequently placed species in the wrong genus. Though Hawkes described species in several papers (Hawkes, 1948, 1951a, 1951b) he was not really considered an expert on aroids.
Research with Araceae also was renewed in South America during the 1950s with the Flora of Suriname project. This work was carried out during the 1950s and mid-1960s by A. M. E. Jonker-Verhoef and her husband F. P. Jonker. The first paper in the series (Jonker-Verhoef & Jonker, 1953a) updated Pulle's 1906 Enumeration of the Vascular Plants of Surinam and described two new species. Later in the same year, a new treatment of the Araceae of Suriname (Jonker-Verhoef & Jonker, 1953b) was published treating 18 genera and 67 species. As a sign that most tropical floras started toward the middle of the present century were begun prematurely, a paper published only six years later added another thirteen species new to the flora (Jonker-Verhoef & Jonker, 1959) and yet most others (Jonker-Verhoef & Jonker, 1966, 1968) report an additional 7 species. The work done by the Jonkers was thorough and detailed, but their interest with the Araceae did not extend beyond Suriname.
FLORISTIC WORK IN CENTRAL AMERICA
Paul C. Standley was more of an aroid specialist since he did Araceae treatments for a half dozen separate Central American flora or florulas that described new Araceae during the decades of the 1930s and 1940s. These floras were for the Panama Canal Zone (Standley, 1928), Lancetilla Valley in Honduras (Standley, 1931), Barro Colorado Island (Standley, 1927, 1933), Belize (Standley & Record, 1936), Costa Rica (Standley, 1937), Panama (Standley, 1944), and Guatemala (Standley & Steyermark, 1958). In addition, he published several other smaller papers with new species descriptions (Standley, 1932, 1940a, 1940b, 1944, 1958b; Standley & Steyermark, 1943; Standley & L. O. Williams, 1951; 1952). Still, considering how many potential new species there were in Central America, Standley and his coworkers did not describe very many. In all, Standley alone or with Julian Steyermark and/or Louis O. Williams described 42 species of Araceae during this era.
RENEWED REVISIONARY EFFORTS AFTER 1950
In addition to the floristic efforts that began in the early 1950’s, considerable new revisionary activity began with a number of new aroid researchers. One of first of these was H. C. D. de Wit who worked exclusively with the limited number of aquatic aroids that can be grown in fish tanks. These plants have a good commerical value and have spawned a number of research projects, most of them centered at the University of Wageningen in Holland and in other places in Europe. The most active research on these aquatic aroids began with de Wit and Karel Rataj and progressed until the time that Niels Jacobsen published several important papers on the genus Cryptocoryne [see below]. New species continue to be discovered in the genus.
De Wit published his first papers, all dealing with Cryptocoryne in 1953 (de Wit, 1953a-c). They were published in popular aquarium magazines Fishkeeping and Waterlife and Het Aquarium. Other species of Cryptocoryne were treated in papers published in succeeding years (de Wit, 1954, 1956, 1957, 1958a-g), and it was not until 1958 that de Wit described his first new species (de Wit, 1958b). He then published many short papers (de Wit, 1959a-i; 1960a-e, 1961a-e, 1963a-d, 1971a-c, 1975a, 1975b, 1976, 1979) in Het Aquarium a Dutch magazine popular with the aquarium enthusiasts. Written in Dutch and of one to four pages in length, each article deals with a single species of Cryptocoryne. Each fascicle is illustrated with photographs or detailed drawings and sometimes with colored paintings or photographs. One additional species was described in Artedi (de Wit, 1975b). The first widely useful paper by de Wit presented a key to all the known species of Cryptocoryne along with detailed photographs (de Wit, 1969).

De Wit's other publications include a short article on pollination in Cryptocoryne (de Wit, 1978a), chromosome numbers (de Wit & Jacobsen, 1982), and a complete revision of another aguatic genus, Lagenandra Dalzell (de Wit, 1978b). The publication is written in Dutch and contains excellent illustrations and keys as well as details on the biology. De Wit has summarized his work nicely in a series of books, all well illustrated with detailed drawings and colored plates. These books deal with numerous aquatics but the Araceae constitute the largest share (de Wit, 1983). The first version was printed in Dutch (de Wit, 1966), reprinted in 1982 (de Wit, 1982), and an essentially identical version was published in 1990 in German (de Wit, 1990).



Simultaneously, the Czech botanist, Karel Rataj was doing revisionary work on Cryptocoryne. His book on Cryptocoryne (Rataj, 1975) divided the genus into 4 subgenera and 16 sections and described three of the subgenera and all of the sections as new. Rataj recognized 52 species of Cryptocoryne while describing seven new species and six new varieties. Another paper described new cultivated species of the genus (Rataj, 1974). Rataj also published a book Aquarium Plants, which he coauthored with T. Horeman (Rataj & Horeman, 1977) as well as a paper dealing with Typhonium flagelliforme (Rataj, 1982).
In the 1950s, Haruyuki Kamemoto, working at the University of Hawaii, carried out an extensive breeding program with Anthurium in order to provide new and beautiful stock for the Hawaiian cut flower industry. Much of his original stock of wild collected material came from a field trip to Panama with Yoneo Sagawa in the early 1960s. Kamemoto's successes were many and most of his publications dealt with the development of new cultivars (Kamemoto & Nakasone, 1955, 1963; Kamemoto & Sheffer, 1978, 1982; Kamemoto et al., 1986, 1993). He also did genetic research with Araceae, especially the inheritance of color in the spathe, in collaboration with R. Y. Iwata, C. S. Tang, S. Wannakrairoj and M. Marutani (Iwata et al., 1985; Marutani et al., 1987; Kamemoto et al., 1988; Wannakrairoj & Kamemoto, 1990a, 1990b). Other technical research done by Kamemoto and his students include the use of gel electrophoresis for the identification of Anthurium cultivars (Kobayashi et al., 1987) and an extensive use of cytology, especially by R. Sheffer, S. Wannakrairoj, K. Kaneko (Kaneko & Kamemoto, 1978), and M. Marutani (Marutani et al., 1988, 1993) [see also Sheffer below].
Kamemoto's many years of research with aroids are summarized in a book entitled Breeding Anthurium in Hawaii (Kamemoto & Kuehnle, 1996), coauthored by Adelheid R. Kuehnle [see Kuehnle below] who took Kamemoto's position at the University of Hawaii upon his retirement.
A small group of researchers in the Department of Horticulture at the University of Hawaii continues the Anthurium studies begun by H. Kamemoto. Most of the work, carried out with students under the supervision of Adelheid R. Kuehnle or in collaboration with her colleagues, Tessie Amore and Nellie Sugii (the latter two, who deal with classical plant breeding and histology), histologist David Webb and biochemist T. S. Tang, deals with aspects of plant cultivation (Kuehnle et al., 1996), breeding, morphology, embryology (Kuehnle et al., 1996), novel methods of regeneration (Kuehnle et al., 1992; Kuehnle & Sugii, 1991a, 1991b) and gene transfer (Kuehnle & Chen, 1994; Chen & Kuehnle, 1996; Kuehnle & Nan, 1991). Tracie K. Matsumoto, a student of Kuehnle, did her thesis on the embryology of Anthurium (Matsumoto, 1994) and has subsequently published other papers on the origin of somatic embryos (Matsumoto et al., 1996) and on improvements of observing plant structures with light microscopy (Matsumoto et al., 1995), and on micropropagation of Anthuriums (Matsumoto & Kuehnle, 1966). Nuttha Kuanprasert, another student, has begun a study of Anthurium fragrances (Kuanprasert & Kuehnle, 1995).
Monroe Birdsey, who did his graduate work at the University of California then taught at Miami-Dade Community College in Miami, was active in the Araceae with research during the 1950s. His unpublished thesis, entitled The morphology and taxonomy of the genus Syngonium Schott (Birdsey, 1955a), was a thorough study with emphasis on anatomy. Always interested in cultivated plants, he published The Cultivated Aroids, one of the earliest popular books of its kind devoted to Araceae (Birdsey, 1951). This work illustrated and described 70 species of Araceae. Shorter works include articles placing Pseudohomalomena pastoensis into synonymy with Zantedeschia aethiopica (Birdsey, 1955b), taxonomic problems with the confusing cultivar "golden pothos" (Epipremnum pinnatum cv. aureum) (Birdsey, 1962b), and the reintroduction of Homalomena roezlii (Birdsey, 1962a) into cultivation. His collection of living plants at his estate in Miami was until his death one of the finest of its kind in the world, possessing many fully-grown species of Araceae.
Donald G. Huttleston, who revised Arisaema of North America, published a discussion of three subspecies of Arisaema (Huttleston, 1949) even before he completed his thesis. His thesis involved a taxonomic study of the Araceae of North America (Huttleston, 1953). Other papers dealt with the nomenclature of Lysichiton (Huttleston, 1955) and further reports on Arisaema (Huttleston, 1981, 1984).
B. Bergdolt (1955), working at Freiburg University in Germany, worked with anatomical and embryological research on leaf mottling and other leaf types.
Finally, in the late 1950s and early 1960s, the Dutch botanist, R. C. Bakhuizen v.d. Brink, though never deemed to be a major player in Araceae, did make significant contributions with his studies of the Araceae of Java (Bakhuizen, 1957; Bakhuizen & Koster, 1963). He also published a paper dealing with the differences in certain members of the Monsteroideae (Bakhuizen, 1958).
Despite the scattered and localized research mentioned earlier it was not until the beginning of the 1960s that much serious research with Araceae re-occurred since the time of Engler and Krause. The early 1960s saw the active publication by taxonomists George S. Bunting, Graziela Maciel Barroso, Dan Nicolson, Mitsuru Hotta, Cecil T. Prime, Harald Riedl, and Hiroyoshi Ohashi. Though Bunting's publication career was strongest during the 1960s, his first paper, a key to the genera of Araceae in Venezuela written in Spanish, was published in the mid-1950s (Bunting, 1956). Articles regarding cultivated aroids came next (Bunting, 1955, 1956b, 1959, 1961b) followed by the publication of his Ph.D. thesis, a revision of the genus Spathiphyllum Schott (Bunting, 1960a) and a continued flurry of publications throughout the 1960s, many of which dealt with mostly Venezuelan genera (Bunting, 1960b; Bunting & Steyermark, 1969) or floristic regions in Venezuela such as Chimantá (Bunting, 1963a) or Auyán-tepuí (Bunting, 1967) and the Sierra de Lema (Bunting, 1963b), the description of new species (Bunting, 1963c) or taxonomic problems with cultivated plants including Spathiphyllum (Bunting, 1961a), Dieffenbachia (Bunting, 1962a, 1963d, 1966a, 1988c), Alocasia (Bunting & Nicolson, 1963), Anthurium (Bunting, 1963d), Monstera (Bunting, 1962d, 1966a, 1966b), Syngonium (Bunting, 1966b), and Philodendron (Bunting, 1966d, 1966e; Moore, 1974). Other papers dealt with the differences between Schizocasia and Alocasia (Bunting, 1962b), the delimitation of genera of the Monsteroideae (Bunting, 1962c), and a discussion of Philodendron hederaceum-scandens complex (Bunting, 1963f). Of his papers treating species of areas other than Venezuela, the most useful are his commentary on the Araceae of Mexico (Bunting, 1965) and a discussion of the anatomy and taxonomy of the Philodendron scandens complex (Bunting, 1968).
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