Camchaya pentagona H.Koyama, Acta Phytotax. Geobot. 35(1-3): 53. 1984.

Bunwong, Sukhonthip, Chantaranothai, Pranom & Keeley, Sterling C., 2014, Revisions and key to the Vernonieae (Compositae) of Thailand, PhytoKeys 37, pp. 25-101 : 54

Camchaya pentagona H.Koyama, Acta Phytotax. Geobot. 35(1-3): 53. 1984.

Type.

Thailand, Ubon Ratchathani; H. Koyama, H. Terao & Th. Wongprasert T-30791 (holotype: KYO!, isotype: AAU!, isotype: L!). Fig. 6D .

Description.

Annual herbs, 20-60 cm tall. Stems erect, terete, inconspicuously ribbed, scabrous with uniseriate and T-shaped hairs. Leaves alternate, ovate or lanceolate, 3-10 by 2-4 cm, margin serrate or sinuate, apex acute, base attenuate, chartaceous; both surfaces scabrous with whip-shaped hairs, cylindrical hairs and capitate glands; lateral veins 5-10-paired; petioles up to 2 cm long. Capitulescences terminal and axillary, paniculate. Capitula broadly campanulate or hemispherical, 13-15 mm long, peduculate. Receptacle convex, 3.5-6 mm in diam., glabrous. Involucres hemispherical, in 8-9 series, 11-12 mm long. Phyllaries imbricate, greenish with purple apex, margin with spines up to 0.5 mm long, outer surface arachnoid and lacking glands; the outer and the middle ones lanceolate, apex spinose; the inner ones lanceolate to oblong, apex acuminate. Florets 80-150; corollas funnelform, purple, puberulous, glands capitate; corolla tubes 6-7 mm long; corolla lobes 2-2.5 mm long. Anthers ca. 2 mm long, apical appendage acute, base rounded. Styles purple, 6-7.5 mm long, branches ca. 2 mm long. Achenes obovate, 1.7-2 mm long, glabrous, 5(-6-9)-ribbed. Pappus in one series of bristles, 2-3.5 mm long, present in some florets, deciduous.

Distribution.

Thailand: Ubon Ratchathani. Endemic.

Specimens examined.

Thailand, Ubon Ratchathani, Sai Moon subdistrict, route number 2222, 15°16.92'N, 105°18.56'E, 27 Oct 2007, S. Bunwong 344 (KKU, US); Nachaluay Distr. 10 Dec 1982, H. Koyama, H.Terao & Th. Wongprasert T-30760 (L); Muang Sam Sib District, 11 Dec 1982, H. Koyama, H.Terao & Th. Wongprasert 30791 (KYO, AAU, L).

Diagnostic characters.

Camchaya pentagona is distinguished by its typically 5-ribbed achenes.

Ecology.

Disturbed area in dipterocarp forest, alt. 220-300 m; flowering October to December.

Vernacular name.

Phu Tab Tim (พู่ทับทิม).

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.