Decaneuropsis H.Rob. & Skvarla, Proc. Biol. Soc. Washington 120(3): 360. 2007.

Bunwong, Sukhonthip, Chantaranothai, Pranom & Keeley, Sterling C., 2014, Revisions and key to the Vernonieae (Compositae) of Thailand, PhytoKeys 37, pp. 25-101 : 62

Decaneuropsis H.Rob. & Skvarla, Proc. Biol. Soc. Washington 120(3): 360. 2007.

Type.

Vernonia cumingiana Benth. in Hook.f., Kew Journ. 4: 232. 1852.

Description.

Perennial plants. Stems scandent, young branches terete, pubescent or glabrous. Leaves simple, alternate, petiolate, pubescent with uniseriate hairs; lamina ovate, lanceolate or elliptic; margin entire, apex acute or acuminate, base cuneate, subcoriaceous. Capitulescences terminal or axillary. Capitula discoid, homogamous, pedunculate, florets bisexual and fertile. Involucre campanulate, in 4-6-series. Phyllaries imbricate, 7-12 mm long, persistent, lacking glands. Corollas funnelform, purple or white, actinomorphic, corolla basal tubes slender, closely investing style shaft; corolla lobes 5. Anthers 5, syngenesious. Styles 2-branched, inner surface covered with stigmatic papillae, outer surface covered with sweeping hairs on the outer surface reaching below style bifurcation. Achenes clavate or turbinate, 10-ribbed, hairy, without glands, carpopodium present. Pappus in 2 series of bristles. Pollen subechinolophate, 3-colporate, with micropuncta.

Three species are recognized in Thailand.

Key to the species

1	Phyllaries whitish puberulous	2
-	Phyllaries ferruginous tomentose	Decaneuropsis cumingiana
2	Phyllaries obtuse; leaves glandular	Decaneuropsis garrettiana
-	Phyllaries acute; leaves eglandular	Decaneuropsis eberhardtii