Acilepis tonkinensis (Gagnep.) H.Rob. & Skvarla, Proc. Biol. Soc. Washington 122(2): 144. 2009.

Bunwong, Sukhonthip, Chantaranothai, Pranom & Keeley, Sterling C., 2014, Revisions and key to the Vernonieae (Compositae) of Thailand, PhytoKeys 37, pp. 25-101 : 48-49

Acilepis tonkinensis (Gagnep.) H.Rob. & Skvarla, Proc. Biol. Soc. Washington 122(2): 144. 2009.

Vernonia tonkinensis Gagnep., Bull. Mus. Hist. Nat. 25: 492. 1919.

Type.

Vietnam, Tonkin, Balansa 3078 (holotype: P!).

Description.

Perennial herbs, 1-1.5 m tall. Stem erect, inconspicuously ribbed, villose. Leaves alternate, 5-10 by 1.5-4 cm, elliptic or obovate, margin serrate, apex acute, base cuneate or truncate, subcoriaceous; upper surface scabrous, lower surface pilose glandular; lateral veins 6-11-paired; petioles up to 5 mm long. Capitulescences terminal, paniculate. Capitula campanulate, 9-12 mm long, pedunculate. Receptacle flat, hairy. Involucres broadly campanulate, in 5-6 series, 8-10 mm long, herbaceous. Phyllaries purple, outer surface arachnoid, glands capitate; the outer and the middle ones ovate, apex acute; the inner ones ovate-lanceolate to oblong, apex apiculate. Florets ca. 20; corollas funnelform, purple, glandular; co rolla tubes ca. 5 mm long; corolla lobes ca. 4 mm long. Achenes subterete, ca. 3 mm long, 10-ribbed, pubescent with twin hairs and capitate glands. Pappus bristles, the inner ones 8-9 mm long.

Distribution.

Thailand: Chiang Mai. Vietnam.

Specimens examined.

Thailand, Chiang Mai, Doi Sa Ket, 18°52.26'N, 99°8.17'E, 15 Feb 1983, H. Koyama, H. Terao & Th. Wongprasert T-33577 (KYO); Doi Sa Ket, J. Kubiniok 392/6 (CMU).

Diagnostic characters.

Acilepis tonkinensis can be recognized by its pubescent receptacle and broadly ovate phyllaries with acute apices.

Ecology.

Granite bedrock in dry dipterocarp forest, alt. 930-1200 m; flowering January to February.

Vernacular name.

Dok Muang Doi (ดอกม่วงดอย).