สำนักราชบัณฑิตยสภา

142 The Journal of the Royal Institute of Thailand Volume III - 2011 142 Taxonomic Revision of the Genus Hedychium J. Ko.. nig (Zingiberaceae) in Thailand (Part I) Terrestrial, perennial herb. Pseudostems 1.3-1.7 m high, bladeless sheaths 2-4. Ligule oblong, 6.5-7.2 by 3.3-4.0 cm, apex rounded-acute or emarginate, membranous, pubescent, greenish. Leaves sessile, blade lanceolate-oblong, 65.0- 69.1 by 15.5-17.3 cm, base cuneate, apex acuminate, margin slightly undulate, upper surface glabrous, lower surface pubescent. Inflorescence a terminal spike, erect, 18.0-26.7 cm long; peduncle 6.2-7.1 cm long; bracts conical imbricate- elongate to visible rachis, obovate, 5.3-6.8 by 2.5-3.4 cm, apex acute, pubescent, green, each bract subtending of (2-)3-4 flowers; bracteole, tubular, 4.3-4.7 by 1.3-1.6 cm, apex acute, membranous, pubescent, greenish-white; second bracteole, tubular, 4.0-4.5 by 0.9-1.0 cm, apex acute, membranous, pubescent, greenish- white; third bracteole tubular, 3.2-3.9 by 0.7-0.8 cm, apex acute, membranous, pubescent, greenish-white; fourth bracteole tubular, 2.9-3.5 by 0.5-0.6 cm, apex acute, membranous, pubescent, greenish-white. Flowers white, fragrant; calyx tubular, 4.5-5.2 by 0.3-0.4 cm, pubescent, apex 2-3-dented; corolla tube slender, 7.3-8.2 by 0.3-0.4 cm, 3-lobed, lobes linear, apex hooded, thorn-liked, white, 4.5-5.0 by 0.4-1.1 cm; lateral staminodes oblanceolate to broadly oblong-elliptic, 3.4-4.5 by 1.7-2.2 cm; labellum suborbicular, 3.5-5.3 by 3.4-5.2 cm, base attenuate into 7-9 mm claw, apex 2-cleft, 0.9-1.3 cm; filament white, 3.0-3.7 cm long; anther dorsifixed, 1.6-1.8 by 0.3-0.4 cm, base divaricate, yellowish; ovary pubescent, 7-8 by 4-5 mm, 3-loculed, placentation axile; epigynous glands 2, slender, ca. 5 mm, long yellowish; stigma densely ciliate, green. Fruits ellipsoid-globose or oblong, 2.8-3.5 by 2.1-2.4 cm, green. Seeds numerous, ellipsoid-globose, 6-8 by 4-5 mm, reddish orange. Thailand.›NORTHERN: Mae Hongson [Khun Yuam]. Distribution.›China (Guangxi, Guizhou, Sichuan, Yunnan), Myanmar and Laos. Ecology.›Open field. Phenology.›Flowering July-August, fruiting August-September. Note.›This variety is related to H. coronarium var. coronarium , but can be easily recognized by its conical imbricate-elongate bracts and/or rachis- visible inflorescences. 6. Hedychium ellipticum Buch.-Ham. ex Sm. in Rees, Cyclop 16: 2. 1811 ; Monandr. Pl. t. 55. 1828; Lodding. Bot. Cabin. T. 1881. 1832; Wall. in Kew J. Bot. 5: 327. 1853; Horan. Monogr.: 25. 1862; Baker in Hook.f., Fl. Br. Ind. 6: 228. 1892; K. Schum. in Engl., Pflanzenr. 4: 48. 1904.› Gandasulium ellipticum (Buch.-Ham. ex Sm.) Kuntze, Revis. Gen. Pl. 2: 690. 1891; H. fastigiatum Volgt, Hort. Suburb. Calcutt.: 570. 1845. 126-149_mac9 4/26/12, 9:15 PM 142