Monosis volkameriifolia (DC.) H.Rob. & Skvarla, Proc. Biol. Soc. Washington 119(4): 606. 2006.

Bunwong, Sukhonthip, Chantaranothai, Pranom & Keeley, Sterling C., 2014, Revisions and key to the Vernonieae (Compositae) of Thailand, PhytoKeys 37, pp. 25-101 : 81-82

Monosis volkameriifolia (DC.) H.Rob. & Skvarla, Proc. Biol. Soc. Washington 119(4): 606. 2006.

Conyza volkameriifolia Wall., Numer. List [Wallich] no. 3001, comp. no. 111, nom. nud.

Vernonia volkameriifolia DC., Prodr. 5: 32. 1836.

Type.

Nepal, Wallich 3001 (holotype: K!). Fig. 9I .

Description.

Small tree, 3-6 m tall. Stems erect, bark grey, young branches inconspicuously ribbed, white tomentose. Leaves alternate, 10-50 by 5-20 cm, obovate or oblanceolate, margin serrate, apex acute, base cuneate, coriaceous; upper surface whitish puberulous, without glands; lower surface whitish puberulous with flagellate hairs and capitate glands; lateral veins 10-20-paired; petioles up to 3 cm long. Capitulescences terminal, thyrsoid paniculate. Capitula campanulate, 9-10 mm long, subsessile or shortly pedunculate. Receptacle flat, 1.5-2 mm in diam., glabrous. Involucres narrowly campanulate or slightly oblong-cylindrical, in 4-5 series. Phyllaries imbricate, light green or purple apically, 4-5 mm long, 2-3 mm in diam., margin piliferous or entire, outer surface white arachnoid without glands; the outer and the middle ones ovate, apex acute; the inner ones ovate or lanceolate, apex acute. Florets 8-10; corollas funnelform, purple, glandular; corolla tubes 5.5-6 mm long; corolla lobes 2-3 mm long. Anthers 3-3.5 mm long, apical appendage acute, base acute. Styles purple, 5-7 mm long, branches 2, 3-4 mm long. Achenes turbinate, 4-5 mm long, 10-ribbed, covered with dense twin hairs and capitate glands. Pappus in 2 series of bristles, the inner ones 7-8 mm long.

Distribution.

Thailand: Mae Hong Son, Chiang Mai, Lamphun, Lampang. China (Yunnan), India, Bhutan, Myanmar, Vietnam.

Specimens examined.

Thailand, Chiang Mai, Doi Sutep Pui national park, 18°48.39'N, 98°54.90'E, 9 Dec 2007, S. Bunwong 362 (KKU, US); Mae Rim, 1 Mar 2008, S. Bunwong 393 (KKU, US); Mae Rim, 2 Apr 1925, Winit 1329 (BK, K); Doi Chiangdao, 5 Nov 1961, K. Bunchuai 110 (BKF); Doi Chiangdao, 7 Jan 1975, R. Geesink, P. Hiepko & C. Phengklai 8160 (AAU, BKF, L); Doi Chiangdao,9 Feb 1983, H. Koyama, H. Terao & Th. Wongprasert T-33277 (BKF); Doi Chiangdao, 4 Mar 1995, J.F. Maxwell 95-212 (BKF, L); Doi Chiangdao, 26 Oct 1979, T. Shimitzu, H. Toyokuni, H. Koyama, T. Yahara & T. Santisuk T-20886 (BKF, L); Doi Sutep, 16 Feb 1983, H. Koyama, H. Terao & Th. Wongprasert T-33616 (BKF); Doi Sutep, 10 Jan 1958, Th. Sørensen, K. Larsen & B. Hansen 6604 (BKF, C, K); Doi InThanon, 22 Nov 1964, K. Bunchuai 1397 (BKF, K, L, P); Doi InThanon, 28 Nov 1930, H.B.G. Garrett 617 (AAU, BKF, K, L, P); Mae Hong Son, Pai, 16 Jan 1983, H. Koyama, H. Terao & Th. Wongprasert T-32615 (BKF); Lampang, Doi Khun Than, 27 Dec 1984, H. Koyama & C. Phengklai T-39091 (BKF, L); Doi Khun Than,2 Jan 1985, H. Koyama & C. Phengklai T-39196 (AAU, BKF, L).

Diagnostic characters.

Monosis volkameriifolia is similar to Monosis parishii in capitula and leaf shape but differs in tree habits and whitish puberulous leaf surfaces.

Ecology.

Hill evergreen or pine-oak forest, alt. 500-1750 m; flowering November to March.

Vernacular name.

Kla Po Pha Du (คละปอพะดุ), Ya Kaa (หญ้าแก้), Ma Hok Ton (มะโหกต้น), Yarn (หยาน).

Figures

Figure 9. Morphology of Vernonieae in Thailand 5. A-B Gymnanthemum extensum C Iodocephalopsis eberhardtii D Koyamasia calcarea E-F Koyamasia curtisii G Kurziella gymnoclada H Monosis parishii I Monosis volkameriifolia