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Taxonomic Revision of the Genus Hedychium J. König (Zingiberaceae) in Thailand (Part 2) 260 The Journal of the Royal Institute of Thailand Vol. 37 No. 1 Jan.-Mar. 2012 Note. _ H. speciosum can be easily recognized by its 1-2-flowered bracts, hairy calyx tubes, elliptic labellum with emarginate-bifid apex, filament twice as long as the labellum and hairy ovary. 18. Hedychium spicatum Sm. in A. Ress Cycl. 17: 8. 1811 [Type: Nepal; Wallich s.n.]; Monandr. Pl. t. 48. 1828; Wall. in Kew J. Bot. 5: 328. 1853; Horan., Monogr.: 24. 1862; Baker. in Hook.f., Fl. Br. Ind. 6: 227. 1892; K. Schum. in Engl., Pflanzenr. 4(46): 50. 1904; T.L. Wu & K. Larsen in Z.L. Wu & PH. Raven, Fl. China 24 : 54. 2000. _ H. roxburghii Sieb. ex Lindl. in J. Hort. Soc. 7: 281. 1852; _ H. sieboldii Wall. in Kew J. Bot. 5: 371. 1853; _ H. album Buch.-Ham. ex Wall. in Kew J. Bot. 5: 328. 1853; _ H. flavescens Lodd. ex Lindl., J. Hort. Soc. London, 7 : 281. 1852; _ H. tavoyanum Horan., Prodr. Monogr. Scitam.: 26. 1862. _ Gandasulium sieboldii (Wall.) Kuntze, Revis. Gen. Pl. 2: 690. 1891; _ G. simile (Blume) Kuntze, Revis. Gen. Pl. 2: 690. 1891. KEY TO THE VARIETIES 1. Inflorescences densely many-flowered var. spicatum 1. Inflorescences laxly few-flowered var. acuminatum var. spicatum Terrestrial, perennial herb. Pseudostems 48.6-166.3 cm high, bladeless sheaths 2-4. Ligule oblong, 1.0-2.2 by 2.2-2.8 cm, membranous, pubescent to sparsely pubescent, apex emarginate or acute. Leaves elliptic-oblong, 28.1-46.4 by 9.4-12.2 cm, base cuneate, apex acute-acuminate, margin slighly undulate, uppersurface glabrous, lower surface glabrous or sparsely hairy,. Inflorescence a terminal spike, erect, 23.1-34.2 cm long; peduncle 6.6-12.2 cm long, glabrous; bracts lax, folded, greenish, lanceolate-oblong, 2.4-4.6 by 1.0-1.9 cm, apex acute, glabrous or sparsely hairy, each subtending a cincinnus of 1 flower; bracteole tubular, (1.3-)2.1-2.9 cm by 4-6 mm, apex acute, membranous, glabrous or sparsely hairy. Flowers white to pale yellow, fragrant; calyx tubular, (2.8-)3.1-4.9 cm by 4-5 mm, apex acute to 3-lobed, glabrous or sparsely hairy; corolla tube slender, 5.2-7.3 (-8.1) cm by 2-3 mm, 3-lobed, lobes linear, 3.5-4.8 cm by 3-6 mm apex hooded, yellowish; lateral staminodes oblanceolate-oblong, (4.6-)5.4-5.9 cm by 3-6(-7) mm, base attenuate into a 0.9-1.2 cm by 2-3 mm claw; labellum obovate, 5-5.3(-6) by (1.9-)3-3.1 cm, base attenuate into a 0.9-2 cm by 3-4 mm claw, apex bilobed, each lobe elliptic, white with pale salmon red patch at base; filament 1.9-2.4 cm long, salmon red; anther dorsifixed, 1.2-1.8 cm by 3-4 mm base divaricate, salmon red; ovary 4-5 by 3-5 mm, 3-loculed, placentation axile, hairy; epigynous glands 2, slender, ca. 2 by 1 mm, yellowish; stigma densely ciliate, green. Fruits ellipsoid- oblong, 1.8-2.9 by 1.3-1.9 cm, hairy, greenish. Seeds numerous, ellipsoid-orbicular, 4-5 by ca. 3 mm, reddish orange.