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Flowers in lax terminal and axillary racemes up to 18(25) cm long, the upper branch racemes often subtended by only a bract instead of a foliage leaf and so forming a compound inflorescence, the branches usually forming an angle of about 45° or more, their axis slender (0.2–1 mm diameter) and usually rather flexuous and curving upwards, glabrous to shortly appressed-pubescent; bracts 2–4(5) × 0.2–0.5 mm, linear-triangular, rather inconspicuous and usually falling early; pedicels 3–6 mm long.
Leaves with (1)2–4(6) pairs of leaflets; petiole (0.3)2–7(10) cm long, petiole and rachis together 5–18 cm long, pubescent like the stem; leaflets (2.5)4–11(14) × (0.1)0.2–0.9(1.1) mm, linear to linear-oblong, or the lower ones sometimes ± elliptic, the apex acute to rounded or occasionally emarginate; upper surface glabrous, lower surface appressed-pubescent; stipules (3)4–12 × 0.3–0.8 mm (up to 17 mm long in var. >i>pilosa), linear, sometimes falcate.
Calyx 3–5.5 mm long, usually shortly appressed-pubescent with greyish hairs, or (var. >i>pilosa) with longer spreading hairs; upper teeth usually joined for most of their length to form an obtuse or acute triangle, or (particularly in var. >i>pilosa) free for more than half their length, the lateral teeth usually about equalling the tube.
Pods 48–70(82) × 4–5 mm, shortly pubescent with usually irregular geniculate hairs, sometimes with rather regular short appressed hairs.
Stems glabrous or with sparse appressed hairs in parts, or (var. pilosa) with rather conspicuous grey spreading hairs.
Petals pink to sometimes purplish, or the keel much paler and often white; standard 12–16(18) mm long.
Annual with a taproot and rather slender, branched stems (40)60–140(180) cm high.
Ovary pubescent; style pubescent.
Stamen tube joined above.
Seeds 10–16(17).
