Camchaya pentagona
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Ordo: Asterales
Familia: Asteraceae
Genus: Camchaya
Name
Camchaya pentagona H.Koyama, Acta Phytotax. Geobot. 35(1-3): 53. 1984. – Wikispecies link – IPNI link – Pensoft Profile
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).
Taxon Treatment
- Bunwong, S; Chantaranothai, P; Keeley, S; 2014: Revisions and key to the Vernonieae (Compositae) of Thailand PhytoKeys, 37: 25-101. doi
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