Camchaya thailandica Bunwong, Chantar. & S.C.Keeley, PhytoKeys 12: 53-57. 2012.

Bunwong, Sukhonthip, Chantaranothai, Pranom & Keeley, Sterling C., 2014, Revisions and key to the Vernonieae (Compositae) of Thailand, PhytoKeys 37, pp. 25-101 : 56-57

Camchaya thailandica Bunwong, Chantar. & S.C.Keeley, PhytoKeys 12: 53-57. 2012.

Type.

Thailand. Prov. Udon Thani, rare on rocky area in Phu Phrabat historical park, S. Bunwong 328 (holotype KKU!, isotype US!). Figs 6H-I .

Description.

Annual herbs, 50-100 cm tall. Stems erect, terete, inconspicuously ribbed; scabrous with uniseriate hairs, T-shaped hairs and glands. Leaves alternate, elliptic to oblong, 3-8 by 2-3 cm, margin serrate, apex acute, base attenuate, chartaceous; both surfaces puberulous with cylindrical hairs, T-shaped hairs and capitate glands; lateral veins 5-10-paired; petioles up to 2 cm long. Capitulescences terminal and axillary, corymbose. Capitula campanulate, 8-10 mm long, pedunculate. Receptacle convex, 2.5-3 mm in diam., glabrous. Involucres broadly campanulate, in 5-6 series, 7-8 mm long, 5-6 mm in diam. Phyllaries imbricate, light green with purple apex, margin pale without spine, outer surface arachnoid glandular; the outer and the middle ones ovate, apex acuminate; the inner ones lanceolate to oblong, apex acuminate. Florets 50-70; corollas funnelform, purple, puberulous, glands capitate; corolla tubes 6-7 mm long; corolla lobes 2.5-3 mm long. Anthers ca. 2 mm long, apical appendage acute, base rounded. Styles purple, 6-7 mm long, branches 2-2.5 mm long. Achenes obovate, ca. 1.5 mm long, glandular, 10-ribbed. Pappus in 1 series of bristles, 1-2 mm long, present in some florets, deciduous.

Distribution.

Thailand: Udon Thani. Endemic.

Specimens examined.

Thailand. Udon Thani, Ban Phue district, Phu Phrabat historical park, 17°43.84'N, 102°29.65'E, S. Bunwong 328 (KKU, US).

Diagnostic characters.

This species is similar to Vernonia gracilis in having ovate phyllaries which its without marginal spine but differs in 10-ribbed achenes and broadly ovate leaf shape.

Ecology.

Rocky areas in dipterocarp forest, alt. 300 m; flowering November to December.

Vernacular name.

Muk Udon (มุกอุดร).

Figures

Figure 6. Morphology of Vernonieae in Thailand 2. A Camchaya gracilis B Camchaya loloana C Camchaya loloana var. mukdahanensis D Camchaya pentagona E-F Camchaya spinulifera G Camchaya tenuiflora H-I Camchaya thailandica.