Heliophila rigidiuscula Sond.

Erect herbs 25-90 cm high with a perennial woody crown, tussock-forming, or with a short, branched basal stem and glabrous, striate, annual shoots; slender or robust. Leaves 2-12.5 cm long, 0.5-4(-7) mm broad, subulate, linear to narrowly lanceolate or oblanceolate, thin or slightly fleshy; stipulate (sometimes only the lower leaves). Racemes terminal on ± leafless peduncles, contracted in flower; in fruit lax, up to 45 cm long. Pedicels often subtended by 2 minute bracts, in flower 1-2.5 cm long, slender, erect; 1.5-3 cm long in fruit, recurved or reflexed. Sepals 4.8-7 mm long, 1.5-2.8 mm broad, oblong, caducous; outer 2 cucullate; inner 2 strongly saccate. Petals 6.5-11.5 mm long, 4-10 mm broad, circular-obovate, rounded, each with a large papillate appendage on one side of the short claw, or occasionally with a large, hollow, cup-like gland on the inside of the claw. Filaments 3.2-5.1 mm and 3.6-5.5 mm long, the 2 short ones each with a large appendage, rarely all 6 with appendages. Anthers 1.6-3.1 mm long. Ovary narrowly oblong, shortly stipitate with a long style and a small capitate stigma; ovules 6-20. Fruits 3-7 cm long, 3-8 mm broad, linear-oblong or almost lanceolate, with straight margins, very shortly stipitate; valves 1-nerved, net-veined, style (3-)5.5-12 mm long, very slightly thickened. Seeds 5-7.5 x 4.5-5.5 mm subcircular to oblong, broadly winged.

It is a subtropical plant.