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Taxonomic Revision of the Genus Hedychium J. König (Zingiberaceae) in Thailand (Part 2) 266 The Journal of the Royal Institute of Thailand Vol. 37 No. 1 Jan.-Mar. 2012 undulate, upper surface glabrous, lower surface pubescent along midrib. Inflorescence a terminal spike, erect, 8.3-28.3 cm long; peduncle 1.8-2.6 cm long, hairy; bracts lax, folded, elliptic, 4.6- 6.4 by 1.5-1.9 cm, apex acute, pubescent, reddish, each subtending a cincinnus of 1-3 flowers; first bracteole ovate-broadly ovate, 2.6-4.8 by 1.6-1.8 cm, apex acute, greenish or reddish; second bracteole ovate, 2.8-2.9 by 1-1.5 cm, apex acute; tertiary bracteole ovate, 2-2.6 cm by 8–9 mm, membranous. Flowers white to pale yellow, fragrant; calyx tubular, 4-4.4 cm by 3-4 mm, apex acute; corolla tube slender, 5.2-8.4 cm by 2-3 mm, 3-lobed, lobes linear, 3-4.1 cm by 2-3 mm, apex hooded, yellowish; lateral staminodes narrowly lanceolate-oblong, 3.3-3.5 cm by 6-8 mm, base attenuate into a 5-7 by 2-3 mm claw; labellum suborbicular to orbicular, 2.2-2.8 by 2.3-2.9 cm, base attenuate into a 5-9 by ca. 4 mm claw, apex 2-cleft, 4-7 mm, white with pale greenish patch at base; filament 3.9-5 cm long, salmon red; anther dorsifixed, 5-6 by 3-4 mm base divaricate, yellowish; ovary 3-4 by ca. 3 mm, 3-loculed, placentation axile, pubescent; epigynous glands 2, slender, ca. 3 by 0.5 mm yellowish; stigma densely ciliate, green. Fruits ovoid-oblong, 1.3-1.6 by 1.3-1.4 cm, pubescent, greenish. Seeds numerous, ellipsoid-orbicular, 0.4-1 cm by 4-5 mm, aril reddish orange. Thailand. _ NORTHERN: Chiang Rai [Doi Khun Nam Nang Non]; Chiang Mai [Doi Inthanon National Park; Doi Chiang Dao Wildlife Sanctuary, Doi Sam Phi Nong; Doi Suthep-Pui National Park]; Nan [Doi Phu Kha National Park, Phu Wae]; Pitsanulok [Phu Soi Dao National Park; Phu Hin Rongkla National Park]; NORTH-EASTERN: Loei [Phu Kradueng National Park Tham Tai waterfall; Phu Luang National Park; Phu Ruea National Park]. Distribution. _ India, China (Guangdong, Guangxi, Hainan,Yunnan), Myanmar, Vietnam. Ecology. _ In lower montane rain florest or lower montane scrub on sand stone, at the altitude of 1,000-1,500 m. Phenology. _ Flowering from November-February. Note. _ H. villosum is related to H. collinum in its small anther (3-5 mm long) but differs in its villous ligules, bracts and bracteoles. Acknowledgement This research project is a part of the five-year project entitled “Studies on fundamental botanical knowledge and DNA fingerprints of the Thai medicinal Waan”, financially supported by the Thai Traditional Medical Knowledge Fund of the Ministry of Public Health. The author would like to thank staffs of BK, BKF, QBG, PSU, K, P, CAL and SING for herbarium accesses and to staffs of our research unit: Mr. Chalermchoke Boonchit, Mr. Supachai Koonterm, Mr. Jeeradej Mayoe, Mr. Piyapong Yupparach, for field assistance.