Global description
Crotalaria ochroleuca is an annual or short lived perennial, erect herb, slightly branched at the base, 50 cm to 1.5 m high. The leaves are alternate, compound, trifoliate, leaflets linear to linear-elliptic. The inflorescences are terminal erect racemes, 10 to 50 cm long. The papilionaceous type flowers are pale yellow or cream streaked in red, with an elongated spout keel, pale green, streaked with brown, blackish towards the summit. The fruits are cylindrical pods, pendulous, many-seeded, about 3.5 mm long, pale yellow or orange.
Cotyledons
The cotyledons are kidney-shaped, sub sessile, and 10 to 14 mm long.
First leaves
First leaves firstly unifoliate then trilofoliate with linear-elliptical leaflets bearing petioles shorter than the leaflets.
General habit
Annual or perennial short life plant, erect, more or less branched at the base, reaching 1.5 to 2 m high.
Underground system
Taproot.
Stem
The stem is cylindrical, more or less woody at the base; young stems and branches are covered with appressed short hairs.
Leaf
The leaves are alternate, compound trifoliate, with petioles 1 to 6 cm long, leaflets linear to lanceolate or elliptic-lanceolate, 5 to 13 cm long and 0.5 to 2 cm wide, glabrous and green on upper surface and grayish puberulous on the underside.
Inflorescence
The inflorescences are erect terminal, loose racemes, 20 to 50 cm long; linear to subulate bracts are2 to 4 mm long.
Flower
The papilionaceous type flowers include: a calyx in cupped shape with 5 lobes, 6 to 8 mm long, truncated at the base and reflected towards the pedicel; corolla cream to pale yellow in colour, oval standard pale yellow or cream veined with reddish or brown,, creams or purple wings, normally shorter than the elongated spout hull, 1.8 to 2.2 cm long, pale green streaked with brown to blackish trend towards the top; 10 stamens gathered in an open sheath at the base and a superior ovary unilocular with curved style.
Fruit
The fruit is a sub-sessile pod, largely cylindrical, 3 to 5 cm long and 1.5 cm wide, pendulous, depressed following the upper suture line, appressed puberulous, black when dry, containing up to 100 seeds.
Seed
The kidney-shaped seeds are quite variable in size, typically about 3.5 mm long, smooth, pale yellow to orange in colour.