Strobocalyx Sch.Bip., Jahresber. Pollichia 18. 170. 1861.

Bunwong, Sukhonthip, Chantaranothai, Pranom & Keeley, Sterling C., 2014, Revisions and key to the Vernonieae (Compositae) of Thailand, PhytoKeys 37, pp. 25-101 : 88

Strobocalyx Sch.Bip., Jahresber. Pollichia 18. 170. 1861.

Type.

Strobocalyx arborea (Buch.-Ham.) Sch.Bip., Jahresber. Pollichia 18: 171. 1861.

Description.

Perennial plants. Stems arborescent or scandent. Leaves simple, alternate, usually petiolate, lamina elliptic or oblong, pubescent with uniseriate or flagellate hairs, margin serrate or entire, apex acute or acuminate, base cuneate, coriaceous. Capitulescences terminal or axillary. Capitula discoid, homogamous, pedunculate or sessile, florets bisexual and fertile. Involucre campanulate, in 2-4 series, 2-4 mm long. Phyllaries imbricate, hairy without glands. Corollas purple to white, actinomorphic, lobes 5. Anthers 5, syngenesious. Styles purple, 2-branched, inner surface covered with stigmatic papillae, outer surface covered with sweeping hairs on the outer surface reaching below style bifurcation. Achenes turbinate, usually 10-ribbed, ca. 2 mm long, hairy with glands, carpopodium present. Pappus in 2 series of bristles, persistent, the outer ones are shorter than the inner ones. Pollen echinate, subechinolophate or echinolophate, 3-colporate, with micropuncta.

Two species are recognized in Thailand.

Key to the species

1	Plants arborescent; capitulescences thyrsoid-paniculate; achenes 3-4-angled	Strobocalyx arborea
-	Plants scandent or shrubby; capitulescences corymbose; achenes 10 ribs	Strobocalyx solanifolia