Indigofera ionii Jarvie & C.H.Stirt.

Small wiry erect or sprawling herb up to 0.8 m tall; sparsely branched, mostly near the base. Stipules free, 2.5-3.0 mm long, appressed to stem, glabrous. Leaves present during early stages of growth, imparipinnate, petiolate. Leaflets 3, occasionally 4 or 5, narrowly obovate, 8-10 x 3-5 mm; terminal largest; base obtuse, apex mucronate, straight, glabrous above, sparsely and evenly scattered with biramous hairs beneath. Petiole 15-25 mm long; petiolule <1 mm long. Inflorescences axillary, 6-10-flowered, racemose, lax, 40-70(-80) mm long. Flowers 5-6(7) mm long, each subtended by a 2.5-3.0 mm long, narrowly triangular caducous bract; pedicel filiform, 2.0-3.5 mm long, elongating and thickening during fruit formation. Calyx 3.0-3.5 mm long, glabrous; tube 1.5-1.6 mm long; teeth 1.5 mm long, more or less equal, triangular; sinus between vexillar teeth broad. Standard 5.0-7.0 mm long and wide, very broadly ovate, claw very short, venation fine, branched from three traces at base, apex slightly emarginate; auricles and appendages absent. Wing petals 6.8-7.0 x 2.5 mm, infolded along lower margin; auricle inflated and flattened; with scattered hairs along the margin towards the apex; lower end of blade notched. Keel petals 6.5-7.0 x 2.0-2.5 mm, apex pubescent. Androecium 6.0-6.5 mm long; vexillar stamen free; anthers uniform, <0.5 mm long, ovate, apiculate, tufted at base; basifixed anthers on long thin filaments; medifixed anthers on short stout filaments. Pistil 5-6 mm long, compressed, <0.5 mm long, glabrous, straight, narrowly oblong, 8-ovuled; style upcurved, height of curvature 1.5 mm. Fruit 30-35 mm long, compressed, surface coarsely rippled, margins distinctly ribbed, dehiscent; septa <1 mm long, white with small orange flecks. Seeds oblong, 2-3 x 2 mm, olive-green. It flowers sporadically from August to April, with peaks between September and January.