สำนักราชบัณฑิตยสภา

The Journal of the Royal Institute of Thailand Volume III - 2011 147 Pornpimon Wongsuwan and Chayan Picheansoonthon Epiphytic, perennial herb. Pseudostems up to 0.6 m high, bladeless sheaths 2-3. Ligule oblong, 3.1-4.9 by 1.3-1.7 cm, apex acute, membranous, greenish. Leaves sessile, blade elliptic-lanceolate, 32.1-36.7 by 7.7-7.8 cm, base cuneate, apex acute, margin slightly undulate, both surfaces glabrous, midrib sparsely hairy. Inflorescence a terminal spike, erect, ca. 8.5 cm long; peduncle ca. 4.2 cm long; bracts imbricate, ovate, 2.8-3.0 by 0.9-1.0 cm, apex acute, greenish with brownish hairy, each subtending a cincinnus of 1 flower; bracteole tubular, ca. 1.2 by 0.3 cm, apex acute, membranous, pubescent or glabrous, greenish. Flowers yellow to orange; calyx tubular, 2.8-3.1 by ca. 3 cm, apex 2- 3-dented, orange; corolla tube curl-backward, 3.5-3.8 by ca. 3 cm, 3-lobed, lobes linear, 5.3-5.8 by 0.4 cm, apex hooded, yellowish; lateral staminodes oblong, 3.7-4.0 by 0.6-0.7 cm, apex acute, curl-backward, margin undulate; labellum, 2.9-3.0 by 0.7-1.1 cm, base attenuate into 0.5 claw, apex deeply divided to the base, 2.4-2.5 cm long, each lobe linear 2.4-3.0 by ca. 0.3 cm, orange; filament 7.7-7.9 cm long, orange; anther dorsified, 1.1-1.2 by 0.2-0.3 cm, base divaricate, yellowish to pale salmon red; ovary pubescent, 4 by ca. 4 mm, 3-loculed, placentation axile; epigynous glands 2, slender, 2-3 by ca. 1 mm, yellowish; stigma densely ciliate, green. Fruits subglobose to globose, 0.8-1.2 by 1.0-1.2 cm, pubescent, greenish. Seeds numerous, oblong, 6-8 by 3-4 mm aril reddish-orange. Thailand.›PENINSULAR: Narathiwat anad Yala [Hala-Bala Wildlife Sanctuary]. Distribution.›Peninsular Malaysia Ecology.›Tropical evergreen rain forest and peat swamp forest. Phenology.›Flowering April-May, fruiting May-June. Vernacular name.›Pud Duean ( ªÿ ¥‡¥◊ Õπ ) Note.›This taxon can be easily recognized by its 1-flowered bracts, yellow flower, curl-backward staminodes and labella. Roots are used to treat ear-ache. Ground root or the whole plant is a remedy for intestinal worms. 10. H. malayanum Ridl. ex Burkill & Holttum, Gard. Bull. Straits Settlem. 3: 82. 1923 [Type: Peninsular Malaysia: Pahang, Fraserûs Hill, October 1921; Ferguson-Davie (holotype K, isotype SING)]; Ridl., Fl. Mal. Pen. 4: 241-242. 1924; C. Picheansoonthon & P. Wongsuwan, J. Royal Inst. Thail. 43(3): 237- 252. 2008. 126-149_mac9 4/26/12, 9:15 PM 147