Acilepis attenuata (DC.) H.Rob. & Skvarla, Proc. Biol. Soc. Washington 122(2): 137. 2009.

Bunwong, Sukhonthip, Chantaranothai, Pranom & Keeley, Sterling C., 2014, Revisions and key to the Vernonieae (Compositae) of Thailand, PhytoKeys 37, pp. 25-101 : 33-35

Acilepis attenuata (DC.) H.Rob. & Skvarla, Proc. Biol. Soc. Washington 122(2): 137. 2009.

Conyza attenuata Wall., Numer. List [Wallich] no. 3020, comp. no. 130, nom. nud.

Vernonia attenuata DC., Prodr. 5: 33. 1836.

Type.

India orientalis, Wallich 3020 (holotype: K!). Fig. 5A .

Description.

Perennial herbs 50-120 cm tall. Stems erect, conspicuously ribbed, puberulous. Leaves simple, rosulate, 9-22 by 2-8 cm, obovate to obovate-lanceolate or elliptic, margin entire or serrate, apex obtuse or acute, base cuneate or attenuate, subcoriaceous, upper surface scabrous and lacking glands; lower surface scabrous with whip-shaped hairs and capitate glands; lateral veins 5-11-paired; petioles up to 5 mm long. Capitulescences terminal, scapose. Capitula campanulate, 15-18 mm long, pedunculate. Receptacle flat, 6-8 mm in diam., glabrous. Involucres campanulate, in 6-7 series, 7-11 mm long, herbaceous. Phyllaries imbricate, green with purple apex, margin piliferous, outer surface arachnoid without glands; the outer and the middle ones ovate, apex apiculate, upper half reflexed; the inner ones ovate-lanceolate to oblong, apex acuminate. Florets 40-65; corollas funnelform, purple, puberulous glandular; corolla tubes 6-8.5 mm long; corolla lobes 2-3 mm long. Anthers 2.5-3 mm long, apical appendage acute, base obtuse. Styles purple, 7-10 mm long, branches 2.5-4 mm long. Achenes subterete, 2.5-3 mm long, 10-ribbed, pubescent with twin hairs and capitate glands. Pappus bristles, the inner ones 7-7.5 mm long.

Distribution.

Thailand: Mae Hong Son, Chiang Mai, Nong Bua Lum Phu, Khon Kaen, Udon Thani, Sakon Nakhon, Kanchanaburi, Satun. Myanmar.

Specimens examined.

Thailand. Loei: Phu Kra Dung national park, 16°52.28'N, 101°50.74'E, 23 Dec 2007, S. Bunwong 373 (KKU, US); Udon Thani, Phu Pra Bath historical park, 17°41.30'N, 102°28.40'E, 2 Nov 2007, S. Bunwong 347 (KKU, US); Khon Kaen, Phu Wieng national park, 15 Nov 2007, S. Bunwong 351 (KKU, US); Sakon Nakhon, Phu Phan national park, 24 Nov 2007, S. Bunwong 354 (KKU, US); Satun, Adang Island, 21 Oct 1979, G. Congdon 62 (AAU, PSU); Mae Hong Son, Pang Ma Pha, 25 Feb 1968, B. Hansen & T. Smitinand 12722 (C, E, K, L, P); Kanchanaburi, Si Sa Wat, 5 Jan 1926, A.F.G. Kerr 10147 (BK, BM, K).

Ecology.

Dipterocarp or dry evergreen forest, alt. 50-780 m; flowering October to February.

Diagnostic characters.

Leaves rosulate and capitulescences terminal with scapose.

Vernacular name.

Kra Dum Muang (กระดุมม่วง).

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.