Prostrate to erect subshrub, 0.2-0.5 m high, stems woody below, scrambling, angular, ± densely appressed, sometimes canescent strigose, scattered with pearl bodies. Stipules 0.5-1.5 mm long, triangular. Leaves pinnately 5-11(15)-foliolate, rachis 2-8(15) mm long, leaflet pairs mostly less than 2 (often 1 or less) mm apart; petioles 0.5-1.0 mm long, clumps of pearl bodies on rachis between leaflet pairs. Terminal leaflet 3-10(15) x 0.5-2.0(4.0) mm, ± linear to oblanceolate, 3-6 or more times longer than wide, apex ± obtuse, sparsely appressed strigose, paler green above, more densely appressed strigose beneath. Inflorescences of (10)2-60(80) mm long, laxly subcapitate, (2)3-15(20)-flowered racemes; peduncle 6-45(55) mm long; pedicels 3.0-7.5 mm long. Flowers 5-7 mm long, red; calyx 1.5-2.5 mm long, strigose; lobes triangular-lanceolate, ± equalling to twice tube length; standard ferruginous to dark brown strigose dorsally; keel apex obtuse. Stamens 4.5-6.0 mm long. Flowering time Sept.-Aug. Pod 18-32 x 2-3 mm.
Virgate subshrub, 0.2-1.0 m high; stems arising from rootstock, ± densely appressed, strigose, often with dark brown hairs, pearl bodies isolated. Stipules 1-3 mm long, subulate. Leaves pinnately 5-11(13)-foliolate, rachis 2-20 mm long, leaflet pairs mostly 2 mm or more apart; petioles 0.5-2.0 mm long. Terminal leaflet (4)5-20 x 1-3(4) mm, ± linear to oblanceolate, apex truncate; sparsely appressed strigose, often paler green above, more densely appressed strigose beneath. Inflorescences of 20-60(80) mm long, spike-like, densely (5)20-40-flowered racemes; peduncle 7-35 mm long; pedicels 3-7 mm long. Flowers 5.5-7.0 mm long, red; calyx 1.5-2.5 mm long, strigose; lobes triangular-lanceolate, ± equalling to twice tube length; standard densely ferruginous to dark brown strigose dorsally; keel apex obtuse. Stamens 4.5-6.0 mm long. Flowering time Oct.-May. Pod 15-32 x 1.6-2.0 mm.
Pube brevi adpressa subcana, caule fruticoso, ramis angulatis, foliis sessilibus 3-4-jugis cum impari pinnarum basi verrucosis, foliolis linearibus versus basin cuneatis apice reflexo-submucronulatis complicatis, stipulis minutis reflexis, racemis axillaribus longe pedunculatis paucifloris, leguminibus cvlindricis 6spermis intus isthmis discretis. Oct.-Rami erecto-patentes abbreviati. Foliola 4-6 lin. longa supra saepius glabra. Legumina pollicaria.
Like I. stricta but racemes on peduncles ± as long as to longer than leaves, and flowers on pedicels 3-7 mm long.