Acilepis peguensis (C.B.Clarke) H.Rob. & Skvarla, Proc. Biol. Soc. Washington 122(2): 141. 2009.

Bunwong, Sukhonthip, Chantaranothai, Pranom & Keeley, Sterling C., 2014, Revisions and key to the Vernonieae (Compositae) of Thailand, PhytoKeys 37, pp. 25-101 : 41-42

Acilepis peguensis (C.B.Clarke) H.Rob. & Skvarla, Proc. Biol. Soc. Washington 122(2): 141. 2009.

Vernonia peguensis C.B.Clarke, Compos. Ind.: 13. 1876.

Acilepis peguensis Type. Myanmar, Yomah province, Pegu, S. Kurz 882 (holotype: K!). Fig. 5E .

Vernonia kradungensis H. Koyama, Bull. Natl. Sci. Mus. Tokyo, Ser. B 30(2): 72. 2005.

Acilepis peguensis Type: Thailand, Loei, Phu Kradung national park, H. Koyama, H. Terao & Th. Wongprasert T-31211 (holotype: KYO!).

Description.

Perennial herbs, 0.5-150 cm tall. Stems erect, conspicuously ribbed, sericeous. Leaves 10-20 by 3-6 cm, oblanceolate or obovate, margin serrate, apex acute or acuminate, base attenuate, chartaceous; both surfaces scabrous with whip-shaped hairs and capitate glands; lateral veins 4-8-paired; petioles up to 30 mm long. Capitulescences terminal or axillary, paniculate. Capitula campanulate, 10-12 mm long, pedunculate. Receptacle flat, 2-2.5 mm in diam., hairy. Involucres narrowly campanulate or slightly oblong-cylindrical, in 4-5 series, 5-6 mm long, 3-4 mm in diam., herbaceous. Phyllaries light green, margin piliferous, outer surface arachnoid, glands capitate; the outer and the middle ones ovate, apex acuminate or aristate; the inner ones lanceolate to oblong, apex acuminate. Florets 10-15; corollas funnelform, white or purple, glandular; corolla tubes 4.5-5 mm long; corolla lobes 2.5-3 mm long. Anthers purple, 3-3.5 mm long, apical appendage acute, base obtuse. Styles purple, 6-7 mm long, branches 2-2.5 mm long. Achenes subterete, 2.5-3.5 mm long, 10-ribbed, glandular. Pappus bristles, the inner ones 5.5-6 mm long.

Distribution.

Thailand: Loei. Myanmar.

Specimens examined.

Thailand, Loei, Phu Kradung national park, 16°52.25'N, 101°50.74'E, 23 Dec 2007, S. Bunwong 372 (KKU, US); Phu Kradung national park, 7 Jul 1949, Bunpheng 264 (K); Phu Kradung national park,18 Dec 1982, H. Koyama, H. Terao & Th. Wongprasert T-31211 (KYO); Phu Kradung national park, 4 Nov 1984, G. Murata, C. Phengklai, S. Mitsuta & T. Yahara T-43083 (BKF, L, KYO); Phu Kradung national park, 4 Nov 1984, H. Nagamasu & N. Nantasan T-43024 (AAU, BKF, KYO, US).

Ecology.

Deciduous or hill dry evergreen forest, alt. 800 m; flowering November to December.

Diagnostic characters.

The distinctive features of Acilepis peguensis are membranaceous leaves and achenes without hair.

Vernacular name.

Dok Khon Kai Noi (ดอกขนไก่น้อย).

Figures

Figure 5. Morphology of Vernonieae in Thailand 1. A Acilepis attenuata B Acilepis divergens C Acilepis namnaoensis D Acilepis ngaoensis E Acilepis peguensis F Acilepis principis G Acilepis saligna H Acilepis silhetensis I Acilepis squarrosa.