Ascending annual to 6 dm; lfls 3–7 pairs, 1–2 cm; fls usually paired (–4) in the upper axils, 25–35 mm, dull yellow in aspect, or the standard marked with violet, the keel commonly dark purple; cal-tube 6–9 mm, the linear-subulate subequal lobes half to two-thirds as long; style with a conspicuous tuft of hairs just behind the tip on the outer (abaxial) side, glabrous on the other side; 2n=14. Native of sw. Europe and w. Asia, occasionally intr. in our range from N.Y. to Va. and Ky., and in se. U.S.
Shrubby formations, fields, herbaceous glades, rarely forests, mountains; at elevations up to 1,800 metres.
Can be grown by seedlings. Seeds needs soaking.
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