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138 The Journal of the Royal Institute of Thailand Volume III - 2011 138 Taxonomic Revision of the Genus Hedychium J. Ko.. nig (Zingiberaceae) in Thailand (Part I) Natuurl. Gesch. Physiol. 5: 257. 1839;› H . prophetae Buch.-Ham. ex Wall., Hookerûs J. Bot. Kew Gard. Misc. 5: 325. 1853;› H . gandasulium Buch.-Ham. ex Wall., Hookerûs J. Bot. Kew Gard. Misc. 5: 325. 1853;› H. coronarium var. maximum Roscoe, Eichler C.F,P. von Martius & auct. Suc. (eds.) Fl. Bras. 3(3): 37. 1890;› Gandasulium coronarium (J. Ko.. nig) Kuntze, Revis. Gen. Pl. 2: 690. 1891;› G. lingulatum (Hassk.) Revis. Gen. Pl. 2: 690. 1891;› Amomum filiforme Hunter ex Ridl., J. Straits Brach Roy. Asiat. Soc. 53: 60. 1909. Figure 5A. KEY TO THE VARIETIES 1. Flowers mostly thoroughly white, labellum with pale lemon green patch at base 2. Bracts usually imbricate var. coronarium 2. Bracts imbricate-elongated to visible rachis var. forrestii 1. Flowers white to pale yellow, labellum with dark yellow or yellow-orange patch at base 3. Labellum with dark yellow patch at base var. flavescenes 3. Labellum with yellow-orange patch at base var. chrysoleucum var. coronarium Terrestrial, perennial herb. Pseudostems 0.7-1.3 m high, leaf sheaths reddish, bladeless sheaths 4-5. Ligule 3.0-4.7 by 2.3-3.1 cm, apex truncate- emarginate, oblong, membranous, pubescent, greenish. Leaves lanceolate-oblong, 34.0-48.1 by 7.2-9 cm, base cuneate, apex acuminate to caudate, margin entire to slightly undulate, upper surface glabrous, lower surface pubescent. Inflorescence a terminal spike, erect, 5.3-7.1 cm long, hairy; peduncle 1.7-4.1 cm long, hairy; bracts conical imbricate, obovate, 5.5-6.0 by 3.0-3.8 cm, apex rounded, glabrous except apex and margin hairy, green, each bract subtending of 5-6 flowers; first bracteole, folded, lanceolate, 3.5-3.7 by 1.0-1.2 cm, apex acute, membranous, glabrous except apex hairy, greenish-white; second bracteole, folded, lanceolate, 3.2-3.3 by ca. 0.8 cm, apex acute, membranous, glabrous except apex hairy, greenish-white; third bracteole folded, lanceolate, ca. 3.1 by 0.6-0.7 cm, apex acute, membranous, glabrous except hairy apex, greenish-white; fourth bracteole lanceolate, 3.0-3.1 by 0.6-0.7 cm, apex acute, membranous, glabrous except hairy apex, greenish-white; fifth bracteole triangular, ca. 2.9 by 0.5 cm, apex acute, membranous, glabrous except hairy apex, greenish-white; sixth bracteole tubular, 2.2-2.4 by 0.2-0.3 cm, apex acute, membranous, glabrous except hairy 126-149_mac9 4/26/12, 9:15 PM 138