Lupinus arboreus

Erect perennial shrub to 2.5 m tall; stems much-branched, pubescent to glabrescent. Leaves palmately 6–11-foliolate; petioles to c. 3 cm long, pubescent; leaflets linear to oblanceolate, mostly 15–35 mm long, 3–10 mm wide, upper surface usually glabrescent, lower surface appressed-pubescent, apex acute or obtuse, mucronate; stipules subulate, to c. 30 mm long. Inflorescences 10–30 cm long; peduncle to c. 10 cm long; flowers mostly whorled; pedicels 6–10 mm long; bracteoles minute. Calyx 8–10 mm long, silky, upper lip virtually entire, lower lip longer, virtually entire; corolla 14–18 mm long, usually bright yellow, sometimes lilac, blue or violet. Pod 50–80 mm long, 8–12 mm wide, sessile, appressed-pubescent; seeds 8–12, obloid, 4–6 mm long, dark brown, obscurely mottled, with a pair of pale spots. Flowers spring and summer.