Psoralea vanberkeliae C.H.Stirt., A.Bello & Muasya

Habit a small sprawling and mounding shrub to 60 cm tall and up to 1.5 m wide, resprouter. Stems 1-10, branching in upper parts of stems; branches erect, rough, grey, mostly bare except for upper parts; young seasonal shoots rough, blackish, hairy. Leaves 9 mm long, 10 mm wide, pinnately 5-foliolate, linear oblong, petiolate, fleshy, basal leaves of seasonal shoots smallest, patent to semi-erect, surface bumpy, glabrous; glands raised, hyaline but drying reddish brown to black, rachis grooved; basal leaflet pair 10 mm long, 0.5 mm wide, equal to or slightly shorter than terminal leaflet; terminal leaflet 10-11 mm long, 0.5 mm wide, flat on adaxial surface with a distinct furrow; stipules 2 mm long, 1 mm wide, straight, fused, joined by a bridge of tissue, glabrescent, teeth broadly triangular, apex acute, fleshy, persistent, becoming prominent and woody when leaves are shed, hairy, hairs short and stubby, covered densely with large raised glands. Inflorescences axillary in upper nodes of short seasonal shoots; peduncle short, 2 mm long, hairy; peduncle bracts paired, minute; cupulum 1 mm long, pale green, trifid, shortly triangular, lobes equal, black-haired, covered in large glands, drying reddish brown; pedicel 2 mm long. Flowers 10-11 mm long, pale to intense mauve to blue, borne solitary per axil. Calyx 6 mm long, 4 mm wide; tube 4 mm long, ribbed; teeth equal, shorter than tube, 2 mm long, pale green, sparsely covered in small black flat hairs and densely encrusted with mixed sized glands on outside; margins of teeth densely black ciliate, inside of teeth densely stubby black-haired; vexillar teeth scarcely fused above tube. Standard petal 9-10 mm long, 7-8 mm wide; claw 2-3 mm long, flattened, erect; very broadly ovate, reflexed to 90 degrees, apex rounded; mauve but dark purple in central area above the M-shaped white nectar “guide”, venation purple; callosities above the claw absent. Wing petals 6-7 mm long, 3-4 mm wide; claw 4-5 mm long; longer than keel petals, strongly folded once along middle, slightly billowy near apex, held parallel to keel, strongly auriculate; sculptur­ing present, upper basal comprised of 4-5 transcostal lamellae. Keel 5-6 mm long, 3-4 mm wide; claw up to 5 mm long. Androecium 7 mm long; tenth stamen free; sheath split abaxially, fenestrate; nectarial ring present, 0.3 mm high. Pistil 7 mm long; ovary 2 mm long, stipitate, glabrous but sparsely covered in curved stalked glands across sides; ovules 1; stigma penicillate. Fruits 1, 5 mm long, 3 mm wide, papery, rugose, reticulate, brown. Seeds 4 mm long, 2.5 mm wide, oblong-elliptic, khaki with black mottles and flecks, hilum central.