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140 The Journal of the Royal Institute of Thailand Volume III - 2011 140 Taxonomic Revision of the Genus Hedychium J. Ko.. nig (Zingiberaceae) in Thailand (Part I) greenish-white; second bracteole folded, lanceolate, 0.6-1.0 by 2.2-2.3 cm, apex acute, membranous, pubescent, greenish-white; third bracteole folded, lanceolate, 1.8-2.0 by 0.5-0.9 cm, apex acute, membranous, pubescent, greenish-white; fourth bracteole lanceolate, 1.7-2.0 by 0.4-0.5 cm, apex acute, membranous, pubescent, greenish-white. Flowers white with yellow-orange patch at the base, fragrant; calyx tubular, 3.5-3.7 by 0.4-0.5 cm, apex 2-3-dented, pubescent; corolla tube slender, 8.0-8.1 by 0.3-0.4 cm, 3-lobed, lobes linear, 3.7-4.3 by 0.5- 0.7 cm, apex hooded, thorn-liked, yellowish; lateral staminodes oblanceolate to broadly oblong-elliptic, 3.0-4.3 by 1.3-2.0 cm; labellum suborbicular, 4.4-5.0 by 4.4-4.5 cm, base attenuate into 1.0-1.1 cm claw, white with yellow-orange patch at base, apex 2-cleft, 0.8-1.9 cm; filament orange, 3.7-4.0 cm long; anther dorsifixed, 1.2-1.4 by 0.3-0.4 cm, base divaricate, yellow-yellowish; ovary pubescent, 5-7 by 4-5 mm, 3-loculed, placentation axile; epigynous glands 2, slender, ca. 5 mm long, yellowish; stigma densely ciliate, green. Fruits ellipsoid- oblong, 2.1-2.5 by 1.6-2.1 cm, green. Seeds numerous, elliptic to globose, 5-8 by 4-5 mm, reddish orange. Thailand.›Cultivated. Distribution.›Cultivated throughout tropical countries. Ecology.›Easily growing in moist areas. Phenology.›Flowering in rainy season. Vernacular name.›Maha Hong ( ¡À“Àß å ). Note.›This variety is easily recognized by its pure white labellum with a yellow-orang patch at the base and conical imbricate-elongate bracts. var. flavescens (Carey ex Roscoe) Baker, in Hook.f., Fl. Br. Ind. 6: 226. 1894 [Type: Himalayas; Wallich s.n.].› H. flavum Bot. Mag. T. 2378, non Roscoe;› H. flavescens Carey ex Roscoe, Monandr. Pl. Scitam.: t. 50. 1825;› H. coronarium var. β . Horan., Monogr. 24. 1862;› Gandasulium peregrium (N.E.Br.) Kuntze, Revis. Gen. Pl. 2: 690. 1891;› H. sulphureum Wall. ex Baker in Hook.f., Fl. Br. Ind. 6: 225. 1894;› H. flavescens Carey ex Roscoe, K. Schum. in Engl., Pflanzenr. 4(46): 46. 1904› H. subditum Turrill, Bull. Misc. Inform. Kew 1914: 370. 1914;› H. coronarium var. subditum (Turrill) Naik, Bull. Bot. Surv. India 3: 71. 1961;› H. emeiense Z.Y.Zhu, Acta Bot. Yunnan. 6: 65. 1984;› H. panzhuum Z.Y.Zhu, Acta Bot. Yunnan. 6: 63. 1984;› H. flavescens Carey ex Roscoe, T.L. Wu & K. Larsen in Z.L. Wu & PH. Raven, Fl. China 24: 373. 2000. Figure 5D. 126-149_mac9 4/26/12, 9:15 PM 140