สำนักราชบัณฑิตยสภา

Taxonomic Revision of the Genus Hedychium J. König (Zingiberaceae) in Thailand (Part 2) 262 The Journal of the Royal Institute of Thailand Vol. 37 No. 1 Jan.-Mar. 2012 Thailand. _ NORTHERN: Mae Hong Son [Pai, Doi Kiew Lom]; Chiang Mai [Doi Suthep-Pui National Park]; Nan [Doi Phu Kha National Park, Doi Phu Wae]. Distribution. _ Nepal, Bhutan, India (Sikkim), China (Xizang, Yunnan). Ecology. _ Lower montane scrub, at the altitude of 900-1,000 m. Phenology. _ Flowering from August-September. Note. _ This species is similar to H. spicatum var. spicatum but differs in its lax and few- flowered inflorescens, and its epiphytic habit. 19. Hedychium stenopetalum Lodd., Bot. Cab. 20: t. 1902. 1833; Baker in Hook.f., Fl. Br. Ind. 6: 231. 1894; K. Schum. in Engl., Pflanzenr. 4(46): 58. 1904. _ H. barbatum Wall. in Kew J. Bot. 5: 373. 1853. _ H. elatum Horan. Monogr. 25. 1862. _ H. coccineum Wall. in Kew J., l.c. _ H. elatum R. Br. var. oryale Horan., Monogr 25. 1862. Terrestrial, perennial herb. Pseudostems 0.7-2.5mhigh, leaf sheaths greenish, bladeless sheaths 2-4. Ligule oblong, 4.3-5.9 by 5-5.8 cm, apex rounded–emarginate, membranous, hairy, greenish or reddish. Leaves petiolate, blade lanceolate-oblong, 36.2-48.3 by 24.1-32.4 cm, base cuneate, apex acuminate to caudate, margin entire to slightly undulate, upper surface glabrous, lower surface hairy. Inflorescence a terminal spike, erect, 36.7-52.3 cm long, hairy; peduncle 12.5-21.1 cm long, hairy; bracts lax, folded, green, lanceolate to obovate, 6-6.9 by 2.3-3 cm, hairy, each subtending a cincinnus of (2-3)-7-11 flowers, apex acute; first bracteole, triangular, 4.9-5.3 by 1.7-2.2 cm, apex acute, membranous, pubescent; second bracteole triangular, 3.5-3.8 by 1.3-1.5 cm, apex acute, mem- branous, pubescent; third bracteole triangular, 2.7-2.9 by 1.5-1.7 cm, apex acute, membranous, pubescent; fourth bracteole triangular, 2.7-2.8 by 1.4-1.6 cm, apex acute, membranous pubescent; fifth bracteole triangular, 2.2-2.8 by 1.3-1.4 cm, apex acute, membranous pubescent; sixth brac - teole triangular, 2.2-2.7 cm by 8-9 mm, apex acute, membranous pubescent; seventh bracteole triangular, 1.9-2.5 cm by 7-9 mm, apex acute, membranous pubescent. Flowers white; calyx tu- bular, 6-6.2 cm by 3-4 mm, pubescent, apex 3-dent; corolla tube slender, 6.2-6.4 cm by ca. 3 mm, 3-lobed, lobes linear, apex hooded, thorn-liked, white, 5.4-5.6 cm by 4-5 mm; lateral staminodes oblanceolate-oblong, 3.2-4.2 by 0.5-1 cm; labellum sub-orbicular to orbicular, 3-4.2 by 2.5-3.4 cm, base attenuate into a 0.7-1.4 cm by 4-6 mm claw, white with pale greenish patch at base, apex 2-cleft, 1.3-1.5 cm; filament 4.9-7.4 cm long, yellowish; anther dorsifixed, 1.2-1.5 cm by 2-3 mm base divaricate, yellowish; ovary pubescent, 4-5 by 6-8 mm, 3-loculed, placentation axile, epigynous glands 2, slender, 5-6 by ca. 1 mm, yellowish; stigma densely ciliate, green. Fruits ovoid to oblong, 3.2-3.9 by 1.4-1.8 cm, green, hairy. Seeds numerous, ellipsoid to sub-globose, 5-6 by 4-5 mm, reddish orange.