Koyamasia curtisii var. tomentosa (Kerr) Bunwong, Chantar. & S.C.Keeley, 2014

Bunwong, Sukhonthip, Chantaranothai, Pranom & Keeley, Sterling C., 2014, Revisions and key to the Vernonieae (Compositae) of Thailand, PhytoKeys 37, pp. 25-101 : 77-78

Koyamasia curtisii var. tomentosa (Kerr) Bunwong, Chantar. & S.C.Keeley comb. nov.

Vernonia curtisii var. tomentosa Kerr, Fl. Siam Enum. 2(3): 238. 1936.

Type.

Thailand, Ratchaburi, A.F.G. Kerr 8997 (isotype: BK!, isotype: BM!, holotype: K!).

Description.

Herbs 20-100 cm tall. Stems erect, conspicuously ribbed, tomentose or villose. Leaves 5-10 by 2-6 cm, ovate or elliptic, margin serrate, apex acute to acuminate, base attenuate, chartaceous; upper surface scabrous; lower surface tomentose; lateral veins 7-12-paired; petioles up to 4 cm long. Capitulescences terminal, solitary or paniculate. Capitula campanulate, 11-13 mm long, pedunculate. Receptacle flat, glabrous. Involucres campanulate, in 6-7 series, 7-8 mm long, 8-10 mm in diam. Phyllaries imbricate, green with purple apex, margin piliferous, outer surface puberulous; the outer and the middle ones ovate to lanceolate, caudate, upper half strongly reflexed; the inner ones lanceolate to oblong, apex acute to acuminate. Florets ca. 60; corollas funnelform, purple; corolla tubes 7-8 mm long; corolla lobes 2-2.5 mm long. Anthers 2.8-3 mm long, apical appendage acute, base obtuse. Styles purple. Achenes clavate, 3-3.5 mm long, 10-ribbed, sparsely glandular. Pappus in 2 series of bristles, the inner ones 5-6 mm long, deciduous.

Distribution.

Thailand: Chiang Mai, Chiang Rai, Phayao, Kanchanaburi, Ratchaburi. Endemic.

Specimens examined.

Thailand. Chiang Mai, Chiangdao wildlife sanctuary, 19°26.08'N, 98°53.76'E, 25 Jul 1990, H. Banziger 702 (CMU); Chiang Rai, Doi Thung, 27 Aug 2000, S. Watthana 875 (AAU, QBG); Phayao, Pak Bok, 5 Sep 2006, S. Pumicong 443 (QBG); Kanchanaburi, 16 Aug 1971, C. Phengklai, B. Sangkhachand & B. Nimanong 2986 (K).

Diagnostic characters.

This plant differs from the typical variety by having tomentose hairs on the lower leaf surfaces.

Ecology.

Limestone mountain, alt. 200-1600 m; flowering June to August.

Vernacular name.

Hua Chai Wai Yarap (หัวใจไวยราพณ์).