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 Camchaya loloana var. mukdahanensis H.Koyama, Acta Phytotax. Geobot. 35(1-3): 52. 1984. Type. Thailand, Mukdahan, Muang District, Dongman Village, H. Koyama et al. T-30941 (holotype: KYO!). Fig. 6C . Description. Annual herbs, 10-70 cm tall. Stems erect, terete, inconspicuously ribbed, scabrous with uniseriate hairs and T-shaped hairs. Leaves alternate, 5-11 by 2-5 cm, ovate or lanceolate, margin serrate or undulate, apex acute or acuminate, base attenuate, chartaceous; both surfaces scabrous with whip-shaped hairs, cylindrical hairs and capitate glands; lateral veins 5-9-paired; petioles up to 15 mm long. Capitulescences terminal and axillary, paniculate. Capitula campanulate, 9-10 mm long, pedunculate. Receptacle convex, 2-2.5 mm in diam., glabrous. Involucres campanulate, in 5-6 series, 7-9 mm long, 4-6 mm in diam. Phyllaries greenish with purple apex, margin with spines up to 0.2 mm long, outer surface arachnoid, glands capitate; the outer lanceolate, apex spinose; the inner ones lanceolate to oblong, apex acuminate. Florets 30-70; corollas funnelform, purple, puberulous, glands capitate; corolla tubes ca. 5.5 mm long; corolla lobes 1.5-2 mm long. Anthers 1.5-2 mm long, apical appendage acute, base rounded. Styles purple, 5-6 mm long, branches ca. 2 mm long. Achenes obovate, 1.3-5 mm long, glabrous, 10-ribbed. Pappus in one series of bristles 1.5-2 mm, absent or deciduous. Distribution. Thailand: Nong Khai, Mukdahan, Ubon Ratchathani. Laos. Specimens examined. Thailand, Mukdahan, Phu Pha Thoep national park, 16°26.08'N , 104°48.33'E , 22 Oct 2007, S . Bunwong 338 (KKU, US); Phu Pha Thoep national park, 12 Dec 1982, H. Koyama, H. Terao & Th. Wongprasert T-30866 (BKF); Phu Pha Thoep national park, 13 Dec 1982, H. Koyama et al. T-30941 (KYO); Mukdahan, Cham Cha Iee, 13 Dec 1982, H. Koyama, H. Terao & Th. Wongprasert T-30904 (BKF, L); Nong Khai, route number 2186, 16 Dec 1982, H. Koyama, H. Terao & Th. Wongprasert T-31137 (BKF, L); Ubon Ratchathani, Sirinthon Dam, 9 Dec 1982, H. Koyama, H. Terao & Th. Wongprasert T-30662 (BKF, L); Sirinthon Dam, M. Norsangsri 1158 (QBG); Gang Ta na national park, 27 Oct 2007, S. Bunwong 343 (KKU, US), Diagnostic characters. Camchaya loloana var. mukdahanensis differs from the typical variety by having smaller capitula, a shorter involucre, and fewer florets. Ecology. Rocky area in dipterocarp forest, alt. 250-400 m; flowering August to January. Vernacular name. Phu Muang (พู่ม่วง).