Pteronia undulata Dc.

A shrub; main branches light coloured, with longitudinally splitting bark; flowering branchlets slender, minutely viscid-puberulous. Leaves opposite, free from each other at the base, obovate, narrowed into a short petiole, 0-5-1.5 cm long, about 08 cm broad, with strongly twisted and crinkled margins, more or less viscid, coriaceous, scabrid on the margins and midrib. Heads 3-6 at the ends of the branchlets, 3-4-flowered, pedunculate, somewhat turbinate, 1.5-2 cm long; peduncles 0.5-1.5 cm long, slender, scabrid-puberulous, with a pair of small oblong opposite bracts at the base of the involucre. Involucral bracts about 3-seriate, gradually longer upwards; the outermost oblong-lanceolate, subacute, about 2 mm long; the innermost linear-oblanceolate, obtuse, about 8 mm long and 2 mm broad; all membranous and glabrous. Receptacle very small. Corolla gradually widened upwards, 1 cm long, glabrous; lobes linear-lanceolate, subacute, 2.5 mm long. Anthers scarcely exserted from the tips of the corolla lobes. Achenes somewhat compressed, abruptly contracted at the apex, 5 mm long, slightly pubescent and glandular. Pappus 1 cm long, nearly white.