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The Journal of the Royal Institute of Thailand Volume II - 2010 The Genus Gagnepainia K. Schum. (Zingiberaceae) in Thailand 92 In fact, it has never been published. A few years later, they listed all 3 taxa for Thailand (Larsen & Larsen, 2000). However, based on available herbarium materials from major herbaria (BK, BKF, QBG, SING, K, and P) and from our field trips throughout Thailand, we have encountered only 2 taxa, G. godefroyi (Baill.) K. Schum. and G. thoreliana (Baill.) K. Schum in Thailand. Several populations around the country were investigated and both species show several deviations from the types and original descriptions. The distribution of this genus in Thailand is revised here for the first time. Gagnepainia K. Schum. in Engl. Pflanzenr. 4(46). 20 Heft: 129. 1904; Loesener in Engl., Nat. Pflanzenfam. 2. ed. 15a: 581. 1930; Larsen et al . in Kubitzki, Fam. Gen. Vasc. Pl. 4: 488. 1998.-non Ehrenb. ex Schweinf. Beitr.– Hemiorchis Baill. in Bull. Soc. Linn. Paris I: 1195. 1985. Perennial herb, rhizomes short. Leafy shoots produced after flowering stems, Leaves oblong or oblong-lanceolate, petiolate. Flowers in pedunculate spikes, usually crowded at the tips of elongating tomentose rachis; calyx tubular, lobes ovate, apex acute; corolla tube slightly dilated towards the mouth, lobes ovate- oblong, recurved; staminodes broadly obovate, or suborbicular; labellum 3-lobed, median lobe form a club-shape elongated appendages, broader than long, emarginate; filament longer than the labellum, curved; anther linear; ovary unilocular; placenta 3, parietal; stylodial glands 2, filiform. Capsules subglobose to ovate, crowned with persistent calyces. Seeds subglobose to globose, arillate. Three species are distributed in Vietnam, Laos, Cambodia and Thailand. Two species are native to Thailand Key to Species 1. Lower leaf surface pubescent to sericeous, flowers green..................1. G. godefroyi 1. Lower leaf surface glabrous, flower whitish.....................................2. G. thoreliana 1. Gagnepainia godefroyi (Baill.) K. Schum. in Engl. Pflanzenrch. Heft 20:130 1904.– Hemiorchis godefroyi Baill. in Bull. Soc. Linn. Paris I: 1196. 1890. Figures 1, 2 and 5B.