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Taxonomic Revision of the Genus Hedychium J. König (Zingiberaceae) in Thailand (Part 2) 252 The Journal of the Royal Institute of Thailand Vol. 37 No. 1 Jan.-Mar. 2012 Distribution. _ China (Simao Xian) and Laos (Champasak). Ecology. _ Lower montane scrub, at the altitude of 1,000-1,500 m. Phenology. _ Flowering from June-August, fruiting from July-September. Note. _ This species can be recognized by its oblanceolate staminodes, elliptic-suborbicular labellum with yellow-red patch at base, 2-cleft apex and pale salmon red filament, twice as long as the labellum. 13. Hedychium pauciflorum S.Q. Tomg, Acta Bot. Yunnan. 8: 43. 1986; T.L. Wu & K. Larsen in Z.L. Wu & PH. Raven, Fl. China 24 : 55. 2000. _ H. thianum Mokkamul & Picheans., Folia Malaysiana 6: 18-19, 21, 24-25; Figs. 1, 3-6. 2005 [Type: Thailand: Chiang Mai, Doi Intha- non ; Mokkamul & Picheansoonthon 588 (holotype BKF, paratypes SING, PEK)]. Epiphytic, perennial herb. Pseudostems 35.5-60 cm high, leaf sheaths green, bladeless sheaths 2-3. Ligule shortly oblong, 2-7 mm long, apex bilobed, lobe rounded, membranous, glabrous, greenish. Leaves sessile, blade elliptic-oblong, 24.9-31.7 by 7-7.2 cm, base cuneate, apex acuminate, margin slightly undulate, both surfaces glabrous. Inflorescence terminal spike, erect, 7.4- 15.3 cm long, laxly few-flowered; peduncle 3.7-5.1 cm long, glabrous; bract lanceolate-oblong, 1.6-2 by 0.9-1 cm, apex acute or rounded, glabrous, green, each subtending a cincinnus of 1 flower; bracteole oblong, 1.3-1.5 cm by 5-6 mm, apex acute, membranous. Flowers white to pale yellow; calyx tubular, 1.7-1.8 cm by 2-3 mm, apex emarginate-acute membranous; corolla tube, 3.9-4.1 cm long, 3-lobed, lobe linear, 2.1-2.4 cm by 2-3 mm; lateral staminodes narrowly lanceolate- oblong, 1.6-1.7 cm by 2-4 mm; labellum narrowly elliptic-oblong, 1.5-1.7 cm by 3-4 mm, apex deeply divided to the base, lobe narrowly oblong, ca. 2 mm wide; filament yellow - ish, 1.9-2 cm long; anther dorsifixed, 0.8-1 cm long, base divaricate, yellowish; ovary, ca. 3 by 2 mm, glabrous, green; epigynous glands 2, ca . 2 mm long, yellowish; stigma densely ciliate, orange. Fruits globose, 1.2-1.5 by 1.2-1.3(-1.5) cm, trilocular, glabrous, green. Seeds nu- merous, aril reddish. Thailand. _ NORTHERN: Mae Hong Son [Pang Mapha, Ban Mae Aumong]; Chiang Mai [Doi Suthep, Sahn Goo-Puping area; Doi Suthep-Pui National Park]; Tak [Mae Moei National Park, road to Mon Kra Ting]; NORTH- EASTERN: Loei [Phu Luang Wildlife Sanctuary]. Distribution. _ China (W Yunnan). Ecology. _ Lower montane pine-oak forest or lower montane scrub, at the altitude of ca. 1,000 m.