Softly woody shrub with spreading branches, up to 2 m. tall; branchlets subherbaceous, silky-pubescent to glabrate. Lvs imparipinnate, up to 15 cm. long, with up to 15 pairs of lflts; lfls subsessile, 1·5-2.5 cm. long, linear-oblong, retuse to obtuse at apex. Racemes pend., up to 15-fld; fls scarlet, up to 8 cm. long. Calyx campanulate, teeth subulate, erect, 1·5-3 mm. long; standard ovate-acuminate, c. 6 cm. long; wings c. 3 cm. long, lanceolate-falcate, acute; keel c. 6 cm. or more long, falcate-acuminate. Pods up to 8 cm. long, turgid; seeds ∞.

n = 16

2n = 32

2n = 32

Upright or spreading multistemmed shrub, 1-2 m high, 1-2 m wide, branching 6om near base. Cotyledons 2(-3), 13-18 × 5-7 mm, oblong to oblong-elliptic, ± patent, dark green; lamina each side of midrib usually asymmetrical, often ± lunate; apex rounded; base oblique. Leaves 80-130 × 30- 50 mm, imparipinnate, 14-21-foliolate; lower 1-2 leaflet pairs ± opposite; otherwise alternate; petiole and rachis up to 100 mm long, up to 1.8 mm diam., channelled. Leaflet lamina 17-26 × 5-7 mm, narrowly lanceolate, narrowly oblong, narrowly oblong-lanceolate to narrowly elliptic; leaflets at distal end sometimes smaller, although terminal leaflet usually similar in size to lower proximal leaflets; adaxial surface grey-green to olive-green, matt to slightly glossy, with a reticulum of buttressed ridges, glabrous to moderately hairy; abaxial surface pale green, matt, sparsely to moderately hairy; margin flat; apex retuse; base obtuse; petiolule 0.4- 0.8 mm long, light green, sparsely to densely hairy; stipules 4.5-6.0 × 2.54.5 mm, lanceolate to narrowly triangular, green, adaxial and abaxial surfaces matt, sparsely hairy. Inflorescence a raceme, 1(-2) per node, pendulous, each with up to 40 buds, only 4-10 buds producing flowers. Rachis up to 80 mm long, 0.8-1.3 mm diam.; rachis, pedicels, bracts, and bracteoles sparsely to moderately hairy. Bracts 4.0- 5.0 × 1.5-2.0 mm, subtending pedicels, narrowly triangular, green; adaxial and abaxial surfaces matt. Pedicel 15-20 mm long, 0.7-1.0 mm diam., pendulous. Bracteoles 1.8-1.9 × 0.6-0.7 mm, inserted ± midway along pedicel, narrowly lanceolate to narrowly triangular. Calyx 7.0-8.0 mm long, 7.6- 8.4 mm wide, light green, outer surface sparsely to moderately hairy, inner surface glabrous; lobes 3.0- 4.5 mm long, 0.8-1.2 mm wide at base, narrowly triangular to shortly subulate, densely hairy on adaxial and abaxial surfaces; margin hairy. Corolla papilionaceous, light salmon-red to salmon-pink, or rarely cream to light cream-yellow; proximal parts of standard, wing, and keel petals white. Standard 52-55 × 17-23 mm, upright, with dark blotch at base, strongly reflexed 7-9 mm from base; apex acuminate; claw 4.8-5.3 mm long. Wings 26-29 × 5-10 mm, oblong, linear-oblong, or lanceolate, often tapering slightly in distal part; apex acute to obtuse; claw 4.5-5.5 mm long; auricle 1.5-2.2 mm deep. Keel 57-62 × 12-16 mm, ovate, rostrate, tapering to a strongly acuminate and curved apex; claw 7.0- 8.0 mm long; auricle 2.2-2.7 mm deep. Stamens 40- 60 mm long; ventral filaments fused for 27-37 mm; single dorsal filament free, 40-50 mm long, bent at base; anthers ± in two whorls or held at various heights; anthers 1.4-1.7 mm long. Pistil exserted beyond stamens; stipe 7-8 mm long, glabrous, slightly bent or curved; ovary 15-20 mm long, glabrous, with 50-61 ovules; style 35-40 mm long, bearded on upper surface for c. 1/3 length; hairs up to 0.8 mm long. Fruit a follicle, 50-90 × 8-22 mm, rounded to weakly dorsiventrally compressed in transverse section, pendulous, persistent, when dehiscent 40-70 × 18-28 mm, oblong to obovate, weakly curved or flattened in the same plane; seeds persistent. Seeds 3.0-3.5 mm long, 2.5-3.0 mm deep, 1.4- 1.6 mm thick, reniform, mottled black and olive-green.