Short-lived perennial herb, 9–12 dm. tall, with a single stem, woody at the very base, laxly branched above, glabrous.. Leaves 3–foliolate; leaflets elliptic-lanceolate above, up to 7 cm. long and 2·4 cm. wide, and broadly elliptic below, up to 12·5 cm. long and 5·5 cm. wide, usually slightly acuminate, acute or bluntly pointed; petiole 3–10 cm. long.. Stipules absent.. Racemes lax, up to 24 cm. long, with ± 4–12 flowers on the slender rhachis; bracts filiform or subulate, up to 2–3·5 mm. long, rather persistent; bracteoles inserted on the pedicel, up to 1 mm. long.. Calyx 15–16 mm. long, basally narrowed into a prominent receptacle; upper lobes free in the mature flowers, narrowly attenuate-triangular, ± twice as long as the tube.. Standard ovate, yellow, flushed with purple; wings a little over half as long as the keel; keel strongly rounded about the middle, with a well-developed truncate upwardly directed untwisted beak, 25–27 mm. long, speckled dull purple.. Pod narrowly cylindrical, parallel-sided, rather abruptly contracted into the 8–9 mm. long stipe, 56–58 mm. long, 9 mm. across, conspicuously transverse-veined, ± 16–18–seeded.. Seeds unknown.
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