Camchaya pentagona H.Koyama, Acta Phytotax. Geobot. 35(1-3): 53. 1984.
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publication ID |
https://dx.doi.org/10.3897/phytokeys.37.6499 |
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persistent identifier |
https://treatment.plazi.org/id/840D1AF6-15A7-5102-98DD-386C793A3A88 |
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treatment provided by |
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scientific name |
Camchaya pentagona H.Koyama, Acta Phytotax. Geobot. 35(1-3): 53. 1984. |
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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 View Figure 6 .
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).
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