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127 Chayan Picheansoonthon and Pornpimol Wongsuwan «“√ “√ √“™∫— ≥±‘ µ¬ ∂“π ªï ∑’Ë ÛÛ ©∫— ∫∑’Ë Û °.§.-°.¬. ÚııÒ closely surround the flower and the second flower (if present) bloom much later than the first one. This species was seen in Phu Luang Wildlife Sanctuary (Changwat Loei) and Doi Intanon National Park (Changwat Chiang Mai). [Figs. 23 & 24] 19. H. tomentosum Sirirugsa & K. Larsen, Nord. J. Bot. 15 (1995) 303. Type : Beusekom & Phengklai 1348, Thailand Chiang Mai, Doi Chiang Dao (holotype C) This is one of a few Thai endemism described in 1995. The plant has so far been recorded only from limestone ridges of Doi Chiang Dao Wildlife Sanctuary (Changwat Chiang Mai) at the altitude of ca . 2,000 m. It is closely allied to H. griffithianum Wall. but differ by the following characters: no glandular line on the leaf surface, densely hairy on the lower leaf surface, smaller, elliptic-oblong, deeper divided labellum. [Figs. 25 & 26] 20. H. villosum Wall. in Roxb., Fl. Ind. 1 (1820) 12. Type: to be selected This epiphytic taxon growing on trees or rocky ground is one of the widely distributed species, ranging from India, Tibet, Myanmar, South China, Thailand. Indochina to Malay Peninsula. In Thailand, it can be found at Doi Chiang Dao, Doi Inthanon (Changwat Chiang Mai), Phu Miang (Changwat Uttaradit), Phu Luang, Phu Kradueng (Changwat Loei). The inflorescence of this species is erect with a pubescent rachis. The bracts are not imbricate, oblong, hairy, apex round, and subtend 4-6 flowers. The flowers of this taxon have hairy calyx and corolla tubes, white linear staminodes, white clawed labella deeply devided into obovate-oblong halves, stamens with long filaments and sagittate anthers, and densely hairy ovary. [Fig. 27] A new record for Thailand 21. H. malayanum Ridl. ex Burkill & Holttum, Gard. Bull. Straits Settlem. 3 (1923) 82. Type: Ferguson-Davie (Malay- sia, Fraserûs Hill) (holotype K, isotype SING) Epiphytic, perennial herb with tuberous rhizomes. Pseudostems 25.0-53.0 cm tall, leaf sheaths green, margin red, bladeless sheaths 2-3. Leaves 4-6, subsessile or petiolate, petiole 1.5-5.0 cm long; blade elliptic-oblong, 28.0-42.0 by 9.0-12.7 cm, apex acute or shortly acuminate, base cuneate, margin slightly undulate, upper surface glabrous, lower surface hairy along the midrib; ligule ovate, 5.2-5.6 cm long, membranous, pale greenish, outer surface sparsely hairy, apex acute. Inflorescence terminal spike, erect, 10.3-14.0 cm long, peduncle 7.5-10.5 cm long; bracts 4-9, imbricate, overlapping, broadly ovate, 4.5-5.0 by 4.7-6.3 cm, green with reddish margin, outer surface sparsely hairy, 1-2 flowered, apex rounded or acute, margin free to the base; bracteoles tubular, 3.5-4.0 by 1.8-2.4 cm, reddish, outer surface hairy, apex acute, split on one side to a depth of ca. 1.5 cm. Flowers white; calyx tube slender 5.5-6.8 cm long, glabrous; corolla tube narrow, 9.0-11.5 cm long, 3-lobed, lobe linear, 4.0-4.5 by ca. 0.1 cm; lateral staminodes narrowly lanceolate-oblong, 4.5-5.5 by ca. 0.3 cm; labellum shorter than stamenodes, obovate, 3.8-5.1 by 1.0-1.6 cm, deeply divided, clawed, the claw 0.7-2.3 cm; filament ca. 5 cm long, anthers yellowish, 0.8-1.0 cm long, with basal