Pteronia oppositifolia L.

A small shrub. Branches densely puberulous. Leaves opposite, ovate or ovate-lanceolate, subacute, broad at the base, 0.5-1 cm long, 2.5-5 mm broad, rigidly chartaceous, flat, with a prominent midrib below, densely puberulous on both surfaces Heads terminal, solitary, about 20-flowered, campanulate, 2 cm long, about 1.25 cm in diameter. Involucral bracts 5-7-seriate, closely imbricate, gradually increasing in size from below, the outer ovate-oblong, the inner oblong or linear-oblong, rounded at the base, scarious with a darker patch on the outside towards the apex, glabrous, shortly ciliate towards the a| ex. Receptacle flat, with long setose, subulate bristles. Corolla 9-10 mm long, glabrous; lobes linear-lanceolate, subobtuse, 2.5 mm long. Achenes 3 mm long, villous with slender ascending white hairs, abruptly contracted and glabrescent at the apex. Pappus reddish, as long as the corolla-tube.