Acilepis chiangdaoensis (H.Koyama) H.Rob. & Skvarla, Proc. Biol. Soc. Washington 122(2): 140. 2009.

Bunwong, Sukhonthip, Chantaranothai, Pranom & Keeley, Sterling C., 2014, Revisions and key to the Vernonieae (Compositae) of Thailand, PhytoKeys 37, pp. 25-101 : 35-36

Acilepis chiangdaoensis (H.Koyama) H.Rob. & Skvarla, Proc. Biol. Soc. Washington 122(2): 140. 2009.

Vernonia chiangdaoensis H.Koyama, Bull. Natl. Sci. Mus. Tokyo, Ser. B 31(2): 69. 2005.

Type.

Thailand, Chiang Mai, Doi Chiangdao, M. Tagawa, K. Iwatsuki & N. Fukuoka T-4038 (holotype: KYO!).

Description.

Perennial herbs, 1-2 m tall. Stems erect, conspicuously ribbed, villose. Leaves 10-30 by 4-10 cm, lanceolate, margin serrate, apex acuminate, base attenuate, subcoriaceous, upper surface scabrous and without glands; lower surface scabrous with whip-shaped hairs, cylindrical hairs and capitate glands; lateral veins 7-10-paired; petioles up to 3 cm long. Capitulescences terminal, paniculate. Capitula campanulate, 10-12 mm long, pedunculate. Receptacle flat, 2-2.5 mm in diam., pubescent. Involucres campanulate in 4-5 series, 8-10 mm long, scarious.Phyllaries imbricate, green or purple apically, margin piliferous, outer surface villose, glands capitate; the outer and the middle ones lanceolate, apex spinose; the inner lanceolate to oblong, apex acuminate. Florets 10-15, narrowly funnelform, purple or white, glandular; corolla tubes 4-5 mm long; corolla lobes 2.5-3 mm long. Anthers 2.5-2.8 mm long, apical appendage acute, base obtuse. Styles purple, 4.5-6 mm long, branches 2.5-3 mm long. Achenes subterete, 2.5-3.5 mm long, 10-ribbed, pubescent with twin hairs and capitate glands. Pappus bristles, the inner ones 6-6.5 mm.

Distribution.

Thailand. Endemic.

Specimens examined.

Thailand. Chiang Mai, Chiangdao wildlife sanctuary, 19°26.08'N, 98°53.76'E, S. Bunwong 77 (KKU, US); Doi Chiangdao, 3 Jan 1966, M. Tagawa, K. Iwatsuki & N. Fukuoka T-4038 (KYO); Chiang Mai, Doi Sutep national park, 22 Dec 1989, J.F. Maxwell 89-1585 (CMU, L); Chiang Mai, Maerim, W. Nanakorn et al. 10191 (QBG); Wang Tao, Th. Sørensen, K. Larsen & B. Hansen 1073 (BKF, C, K).

Ecology.

Mixed deciduous or pine-oak forest, alt. 600-800 m; flowering December to February.

Diagnostic characters.

Large leaves and scarious spinose apical phyllaries.

Vernacular name.

Dok See Pa (ดอกสีป่า), DoK Doi Pa (ดอกดอยป่า).