Acilepis divergens (Edgew.) H.Rob. & Skvarla, Proc. Biol. Soc. Washington 122(2): 140. 2009.

Bunwong, Sukhonthip, Chantaranothai, Pranom & Keeley, Sterling C., 2014, Revisions and key to the Vernonieae (Compositae) of Thailand, PhytoKeys 37, pp. 25-101 : 36-37

Acilepis divergens (Edgew.) H.Rob. & Skvarla, Proc. Biol. Soc. Washington 122(2): 140. 2009.

Conyza divergens Wall., Numer. List [Wallich] no. 3027A, comp. no. 137, nom. nud.

Eupatorium divergens Roxb., Fl. Ind. 3: 414. 1832.

Vernonia divergens (Roxb.) Edgew., J. Asiat. Soc. Bengal 2: 172. 1853.

Type.

India; Wallich 3027A (holotype: K!). Fig. 5B .

Description.

Robust herbs to subshrubs, 1-3 m tall. Stems erect, inconspicuously ribbed, pilose-villose or tomentose. Leaves 10-13 by 3-5 cm, ovate or elliptic, margin serrate, apex acute, base attenuate, subcoriaceous; both surfaces scabrous with whip-shaped hairs and capitate glands; lateral veins 6-10-paired; petioles up to 1 cm long. Capitulescences terminal and axillary, corymbose. Capitula narrowly campanulate, subsessile or shortly pedunculate, 9-10 mm long. Receptacle flat, ca. 1 mm in diam., glabrous. Involucres narrowly campanulate or slightly oblong-cylindrical, in 3-4 series, 4-5 mm long, 3-3.5 mm in diam., herbaceous. Phyllaries green or purple apically, margin piliferous, outer surface arachnoid, glandular; the outer and the middle ones ovate, acuminate or apiculate; the inner ones lanceolate to oblong, apex acuminate. Florets 6-10; corollas funnelform, purple, glandular; corolla tubes 4-5 mm long; corolla lobes 2-2.5 mm long. Anthers 2-2.5 mm long, apical appendage acute, base obtuse. Styles purple, 5-6 mm long, branches 1.5-2 mm long. Achenes obovate, ca. 2 mm long, 10-ribbed, glandular. Pappus bristles, the inner ones 4-5 mm long.

Distribution.

Thailand: Chiang Mai, Phayao, Nan, Tak, Sukhothai, Loei, Kanchanaburi. China (Yunnan), India, Myanmar, Laos, Myanmar, Vietnam.

Specimens examined.

Thailand. Chiang Mai, Doi Angkhang, 19°54.08'N, 99°2.34'E, 3 Jan 2008, S. Bunwong 377 (KKU, US); Chiang Mai, Doi Chiangdao, 29 Dec 1961, K. Bunchuai 102 (BKF, C, E, K, L, P); Doi Chiangdao, 6 Jan 1975, R. Geesink, P. Hiepko & C. Phengklai 8115 (BKF, C); Doi In Thanon, 12 Jan 1994, N. Fukuoka & H. Koyama T-62103 (BKF); Doi In Thanon, 9 Dec 1984, H. Koyama, S. Mitsuta & T. Yahara T-39916 (BKF); Doi In Thanon, 9 Dec 1984, H. Koyama, S. Mitsuta & T. Yahara T-48693 (BKF); Om Koi, 20 Jan 1964, B. Hansen, G. Siedenfaden & T. Smitinand 10796 (BKF, C, L); Doi Sutep, 24 Jan 1909, A.F.G. Kerr 524 (BM, K); Sa Moeng, 3 Feb 1913, A.F.G. Kerr 2918 (BM, K); Chom Thong, 9 Feb 1998, F. Konta, C. Phengklai & S. Khao-iam 4135 (BKF); Kanchanaburi, Don Ta Hom, 13 Apr 1965, Adisai 1046 (BK); Si Sa Wat, 16 Jan 1926, A.F.G. Kerr 10227 (BK, K, BM); Chiang Rai, 25 Dec 1993, Charal 431 (BKF); Tak, Doi Pae Poe, 15 Mar 1968, B. Hansen & T. Smitinand 12926 (BKF, C, E, K, L); Mae Sod, 26 Jan 1985, Y. Paisooksantivatana 1590-85 (BK).

Ecology.

Mixed deciduous and cloud forests, alt. 300-1850 m; flowering October to April.

Diagnostic characters.

Acilepis divergens is clearly distinguished by having a corymbose capitulescences with short peduncle and its capitula that are among the smallest in Acilepis spp.

Vernacular names.

San Ngern (สารเงิน), Nat Foi (หนาดฝอย).

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.