Revisions and key to the Vernonieae (Compositae) of Thailand Author Bunwong, Sukhonthip Maejo University Phrae Campus, Mae Sai, Rong Kwang, Phrae 54140, Thailand Author Chantaranothai, Pranom Applied Taxonomic Research Center, Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand Author Keeley, Sterling C. Department of Botany, University of Hawaii, Honolulu, HI 96816 USA text PhytoKeys 2014 2014-05-13 37 25 101 http://dx.doi.org/10.3897/phytokeys.37.6499 journal article http://dx.doi.org/10.3897/phytokeys.37.6499 1314-2003-37-25 FFE8FFACFF84FFA95573FFFECD03F742 576215 Okia pseudobirmanica (H.Koyama) Bunwong, Chantar. & S.C.Keeley comb. nov. Vernonia pseudobirmanica H.Koyama, Bull. Natl. Sci. Mus. Tokyo, Ser. B 29(1): 16. 2003. Type. Thailand, Tak, Khao Pha War, T. Shimizu, H. Toyokuni, H. Koyama, T. Yahara & T. Santisuk T-18505-bis (holotype: KYO!). Fig. 10B . Description. Perennial herbs, 20-40 cm tall. Stems erect, conspicuously ribbed, puberulous. Leaves cauline, 3-12 by 1-3 cm, elliptic or obovate, margin serrate, apex acuminate, base attenuate, chartaceous; upper surface glabrate or scabrous; lower surface glabrate or pubescent; lateral veins 7-12-paired; petioles up to 1 cm long. Capitulescences terminal, loosely corymbose. Capitula broadly campanulate, 5-6 mm long, pedunculate. Receptacle glabrous. Involucres broadly campanulate, in 4-5 series, ca. 5 mm long. Phyllaries imbricate, green, margin piliferous, outer surface nearly glabrous; the outer and the middle ones linear-oblong, apex acute; the inner ones ovate-lanceolate to oblong, apex obtuse. Florets ca. 20; corollas funnelform, purple, glabrous. Achenes fusiform, ca. 3 mm long, 10-ribbed, glabrous. Pappus in 2 series of bristles, the inner ones ca. 5 mm long. Distribution. Thailand: Tak, Kanchanaburi. Endemic. Specimens examined. Thailand, Tak, Khao Pha War, 16°46.32'N , 98°41.17'E , T. Shimizu, H. Toyokuni, H. Koyama, T. Yahara & T. Santisuk T-18505-bis (KYO); Kanchanaburi, Si Sa Wat, 13 Nov 1971, C.F. van Beusekom, C. Phengklai, R. Geesink & B. Wongwan 3746 (BKF, K, L, P). Diagnostic characters. Okia pseudobirmanica differs from Okia birmanica by its smaller capitula. Ecology. Rare on limestone, alt. 700-900 m; flowering November to December. Vernacular name. Tum Doi (ตุ้มดอย).