Koyamasia curtisii var. curtisii

Bunwong, Sukhonthip, Chantaranothai, Pranom & Keeley, Sterling C., 2014, Revisions and key to the Vernonieae (Compositae) of Thailand, PhytoKeys 37, pp. 25-101 : 76-77

Koyamasia curtisii var. curtisii

Description.

Herbs 20-100 cm tall. Stems erect, conspicuously ribbed, puberulous with stipitate glands. Leaves 5-15 by 2-7 cm, ovate or elliptic, margin serrate, apex acute to acuminate, base attenuate, chartaceous; both surfaces puberulous with whip-shaped hairs and capitate glands; lateral veins 7-12-paired; petioles up to 4 cm long. Capitulescences terminal, solitary or loosely paniculate. Capitula campanulate, 15-20 mm long, pedunculate. Receptacle flat, glabrous. Involucres campanulate, 7-10 mm long, 8-15 mm in diam. Phyllaries imbricate, in 6-7 series, light green or purple apex, margin entire, outer surface puberulous; the outer and the middle ones ovate to lanceolate, apex acuminate with reflexed, the inner ones lanceolate to oblong, apex caudate. Florets ca. 60; corollas funnelform, purple, pubescent with soft hairs and capitate glands; corolla tubes 7-10 mm long; corolla lobes 2-3 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 one series of bristles, 2-8 mm long, deciduous.

Distribution.

Thailand: Lampang, Phetchabun, Kanchanaburi, Prachuap Khiri Khan, Saraburi, Phatthalung, Trang, Satun, Songkla. India, Laos, Myanmar, Vietnam, Malay Peninsula, Malay islands.

Specimens examined.

Thailand, Prachuap Khiri Khan, Kuiburi district, 12°3.44'N, 99°37.59'E, 19 Nov 1964, Adisai 965 (BK); Satun, Tarutao national park, 6°36.19'N, 99°39.15'E, 21 Apr 1969, C. Chermsirivathana 1477 (BK, L); Lampang, Muang Ngao, 17 Jan 1931, Put 4019 (AAU, BK, BM, K, P); Muang Ngao,30 Aug 1925, Winit 757 (K); Kanchanaburi, Si Sa Wat, 10 Aug 1967, Kasem 548 (BK); Si Sa Wat, 30 Jul 1925, A. Marcan 2348 (BM, K, P); Si Sa Wat, 31 Jul 1928, Put 1780 (AAU, BK, K, L, P); Saraburi, Muak Lek, 4 Sep 1925; Muak Lek, Put 1877 (BK),; Muak Lek, 4 Sep 1928, Put 1879 (AAU, BK, BM, E, K, P); Muak Lek, 4 Sep 1963, T. Smitinand & H. Sleumer 1372 (K, L); Trang, Kao Kao, 2 Aug 1929, Rabil 310 (BK, BM, K).

Diagnostic characters.

Koyamasia curtisii is similar to Koyamasia calcarea in having solitary or loosely paniculate capitulescences and reflexed phyllaries but differs in having smaller capitula and a pappus. Both species are found in limestone mountains.

Ecology.

Limestone mountain, alt. 100-500 m; flowering November to April.

Vernacular name.

Chang Nga Pha (ช้างงาผา).