Annual; stems usually sparsely to moderately pilose, sometimes glabrous, hollow, prostrate to erect, not woody at base. Lvs usually moderately to densely pilose, rarely glabrous, sessile; leaflets obovate, elliptic or lanceolate, acute, cuneate to obtuse at base, (2)-3-10-(12) mm long, lacking conspicuous lateral veins. Peduncles < to somewhat > lvs, up to 40 mm long. Infl. 1-2-(3)-flowered. Calyx usually sparsely to moderately pilose, sometimes glabrous; calyx teeth ± equal, linear-lanceolate, usually = or > tube. Corolla yellow, 6-8-(9) mm long; keel ± right angled at about middle or above. Pod straight or slightly curved, rounded, not winged, (15)-20-30-(35) × 1-1.5-(2) mm; seeds c. 1 mm diam.