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Prostrate herb, rooting at the nodes. Leaves digitately 3-foliolate, with long petioles; stipules almost free from the petiole, their bases forming a ring round the stem. Flowers in axillary few-flowered umbels; bracts present; bracteoles absent. Calyx 5-lobed, the 2 upper lobes fused almost to the tip. Corolla glabrous, caducous. Filaments abruptly bent upwards through 90°, not dilated at the tip, not attached to the corolla, the upper one free, the other 9 united; anthers uniform. Ovary glabrous; ovules many; style abruptly bent upwards. Pod 3–4 times as long as calyx, linear, acute, somewhat inflated when ripe, not septate, many-seeded.
Perennial, prostrate herb. Lvs palmately 3-foliolate; principal lateral veins thin and reticulate; leaflets entire or dentate; stipules ± free from petiole. Infl. axillary, umbellate, 1-3-flowered; bracts present at base of pedicel. Calyx teeth 5; upper 2 teeth fused almost to the tip. Corolla deciduous after flowering. Vexillary filament free, others connate; anthers almost uniform. Style glabrous; stigma small, terminal. Pod 2-valved, straight, dehiscent, not armed, many-seeded; seeds estrophiolate, smooth and rounded.
Petals not adnate to the stamens, caducous; standard shortly clawed; wings with the upper proximal corner of the blade extended into a short auricle; keel shorter than the wings, upcurved, rather acute.
Stamens with free portions of filaments abruptly upcurved, not dilated at the apex; vexillary filament free; anthers uniform.
Ovary sessile; ovules many; style slender, tapering, abruptly bent upwards; stigma minute, terminal.
Creeping herbs, usually rooting (and also forming small tubers in P. communis)at the nodes.
Pod 3–4 times as long as the calyx, oblong, acute, beaked, not septate inside, many-seeded.
Inflorescence axillary, 1–3-flowered, pedunculate; bracts present; bracteoles absent.
Leaves digitately 3-foliolate, long-petiolate; stipules free from the petiole.
Calyx with the 2 upper lobes connate almost to their tips.
Seeds with tuberculate testa; funicle filiform.
Flowers pedicellate.
