Polhillia brevicalyx (C.H.Stirt.) B.-e.van Wyk & A.L.Schutte

Small shrub up to 400 mm tall, branching at the base. Leaves digitately trifoliolate; petiole 2-5 mm long, furrowed. Stipules 3-5 mm long, broad based, broadly ovate, free, patent upcurving, sericerous outside, glabrescent inside. Leaflets 7-11 mm long, 3-6 mm wide, subsessile, terminal leaflet larger, obovate, arcuate, somewhat conduplicate, base cuneate, sericeous but sparsely so on abaxial surface. Inflorescences terminal on short axilliary shoots, 1-3-flowered, peduncle 10-14 mm long. Flowers 8.0-8.5 mm long, light yellow, ebracteolate; pedicel, 2-3 mm long. Calyx 6 mm long, tube 3.0-3.5 mm long; vexillar teeth 2.0-2.5 mm long, equally broad at base; lateral and keel lobes mutually coherent to a tripartite lip, narrower, same length as vexillar lobes; sericeous outside, glabrous inside; calyx much shorter than the standard, scarcely bilabiate, not as in most Argyrolobiums. Standard 10 mm long, 7.0-7.5 mm wide; claw 3 mm long, 1 mm wide; blade broadly ovate, apex rounded to slightly emarginate, scarcely auriculate, sericeous along the midrib at the back; appendages present, scarcely swollen. Wing petals 9.0-9.5 mm long, blade 3-4 mm wide, claw 3 mm long, longer than the keel but tips curve in and rest against the sides of the keel so exposing the apex of the keel, auriculate; sculpturing upper basal and upper central, intracostal comprising 3-4 rows of 8-10 irregular lunae gradually becoming smaller and diffuse towards the upper rim. Keel petals fused from the apex for one-third their length as far as the point of flexure; blade 5-6 mm long, 3 mm wide, infolded slightly near junction of blade with the claw. Androecium 9 mm long, monadelphous, slit on adaxial side; anthers dimorphic with 5 linear-oblong basifixed anthers alternating with 5-ovate dorsifixed anthers, terminal anther narrowly-ovate-oblong and intermediate in size. Pistil 9 mm long; ovary 6 mm long, compressed, subsessile, villous as far as point of flexure; height of curvature 3 mm; stigma minute. Fruits and seeds unknown.