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Leaves almost always estipulate, subsessile, simple; blade (1.2)2–8.5 × 0.2–1(1.5) cm, linear to oblong-lanceolate, oblong or rarely elliptic-obovate, glabrous or practically so, ± glaucous, sometimes drying blackish.
An annual herb. It grows 1 m high. The stems are slender. The leaves are simple and 8.5 cm long and narrow. The flowers are pale yellow. The fruit are pods and 2.5-3.5 cm long. There are 3 subspecies.
Standard subcircular, pale yellow, veined brownish, glabrous outside; wings exceeding the keel, bright yellow; keel 6–8 mm long, semicircular, crested behind the small beak.
Erect annual or short-lived perennial, laxly branched above, up to 0.5–1.2(1.8) m tall, with a rather slender glabrous or subglabrous stem.
Racemes laxly 3–12-flowered; bracts 1–9 mm long, linear to narrowly elliptic; bracteoles on the pedicel, filiform, small.
Pod with the (3)4–7 mm long stipe (1.8)2.4–3.6 cm long, cylindrical, glabrous, 24–32-seeded.
Calyx 4–7 mm long, glabrous or sparsely puberulous; lobes narrow, longer than the tube.
Seeds 2–3 mm long, obliquely oblong-cordiform, smooth, shiny, bottle-green to brown.
Flowers yellow, distant on lax axillary and terminal racemes
Erect glabrous herb, 1–3 tt. high, or taller in long grass
Plant drying black in var. welwitschii Bak. f.
