Pteronia tenuifolia Dc.

Stem simple or subsimple, arising from a rhizome, up to 0.3 m [as '1 ft.'] high, slender, angular, glabrous, straw-coloured when dry. Leaves opposite, free and articulating at the base, acicular, acute or subacute, 2-3-5 cm long, about 1 mm thick, warted, otherwise glabrous, the warts giving a crenulate appearance to the, surface. Heads solitary, terminal, pedunculate, or subsessile, oblong-ellipsoid, 2-2.5 cm long, scarcely 2 cm in diameter across the top of the flowers. Involucral bracts about 6-seriate, gradually increasing upwards; the outermost ovate-oblong, about 4 mm long and 2.5 mm broad; the innermost broadly linear, 1.5 cm long and about 5 mm broad; all rounded at the apex, coriaceous, with a broad fleshy keel on the back towards the apex, very narrowly membranous and finely serrulate on the margin, glabrous. Receptacle flat, honeycombed, not fimbriate. Corolla 1.3 cm long, glabrous; lobes linear, acute, 5 mm long. Anthers 5 mm long. Achenes 5 mm long, silky-villous with appressed hairs. Pappus 1 cm long.