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The Journal of the Royal Institute of Thailand Volume III - 2011 127 Pornpimon Wongsuwan and Chayan Picheansoonthon Previous attempt to revise the genus in Thailand resulted in an account of 17 species and 1 unknown taxon (Sirirugsa & Larsen 1995). Since then, 2 new species, Hedychium khaomaenense Picheans. & Mokkamul and H. thaianum Mokkamul & Picheans. were added (Picheansoonthon & Mokkamul 2005). Later, Larsen & Larsen (2006) preliminarily listed 22 species for Thailand. However, 24 taxa (22 species and two varieties) were preliminary recognized for Thailand, including a newly-recorded Malaysian taxon, H. malayanum Ridl. (Picheansoonthon & Wongsuwan 2008). Since then, two other new taxa, Hedychium muanwongyathiae Picheans. & Wongsuwan and H. phuluangense Picheans. & Wongsuwan, were added (Picheansoonthon & Wongsuwan 2009). The revision of the genus was concluded with 21 species and 6 varieties (Wongsuwan 2010), of which a new taxon ( H. siamense Picheans. & Wonsuwan) and a new record ( H. neocarneum T.L. Wu, K. Larsen & Turland) were further recognized (Picheansoonthon & Wongsuwan 2011). The revision of the genus for Thailand is presented in 2 parts. In this first part a brief historical background, description of the genus, keys to all species and varieties accounted for Thailand, and descriptions of the first 10 species and varieties (arranged in alphabetical order) were presented. Hedychium J. Ko.. nig J. Ko.. nig in Retz., Obs. 3: 73. 1783; Roxb., Fl. Ind. ed. 1: 9. 1820; Blume, Enum. Pl. Javae 1: 55. 1827; Roscoe, Monandr. Pl. t. 6: 47. 1828; Lestiboudois in Ann. Sci. Nat. 17: 113. 1829; Wall. In Hook. Kew Gard. Misc. 5: 321. 1853; Horan. Monogr. 24. 1862; Benth. & Hook.f., Gen Pl. 3: 642. 1883; O.G. Peters. In Engler & Prantl, Pflanzenfam. 3(6): 19. 1889; Baker in Hook.f., Fl. Br. Ind. 6: 225. 1894; K. Schum. in Engl., Pflanzenr. 4(46): 40. 1904; Gagnep. in Lecomte, Fl. Gn. I.-C. 6: 70. 1908; Ridl., Fl. Mal. Pen. 4: 241. 1924; Fl. Java 3: 64-67. 1968; T.L. Wu & K. Larsen in Z.L. Wu & PH. Raven, Fl. China 24: 370-371. 2000; Holtt. in Gard. Bull. Sing. 13: 72-73. 1950.›Gamochilus T. Lestib., Ann. Sci. Nat. Bot. 2(15): 341. 1841.› Gandasulium Rumph. ex Kuntze, Revis. Gen. Pl. 2: 690. 1891.› Brachychilum (R.Br. ex Wall.) Petersen, Bot. Tidsskr. 18: 262. 1893. Terrestrial, epiphytic or epilithic, perennial herb. Pseudostems 0.4-2.4 m high, leaf sheaths greenish or reddish, bladeless sheaths 2-5. Ligule oblong, 0.2-5.9 cm long, pubescent or glabrous, apex truncate-emarginate, acute, bilobed 126-149_mac9 4/26/12, 9:15 PM 127