Lathyrus annuus L., it is a glabrous annual herbaceous species. Stems up to 2 m long or more, climbing, winged. Stipules linear-lanceolate, semi-sagittate or semi-hastate. Leaves petiolate, with a pair of opposite leaflets and terminating in a branched tendril; petiole 13–50 mm long, winged. Leaflets 20-170 x 1-18 (-23) mm, linear to linear-elliptic, usually acuminate. Racemes long-pedunculate, bracteate, with 1-4 flowers; peduncles usually shorter than the subtending leaf. Flowers pedicellate; pedicels 3-8 mm long. Calyx teeth slightly longer than the tube, keeled; corolla 12-18 mm long, yellow, with reddish veins on the standard. Pods 30-80 x 7-12 mm, oblong, reticulate, glandular when mature, containing 5–9 seeds. Seeds 4.92-5.25 x 4.90-5.14 x 4.56-5.21 mm, sub-spherical or sub-cuboidal. Hilum narrowly ovate to cuneate, 2.14-2.34 mm long, occupying 1/8-1/7 of the seed’s circumference. Surface colliculate, grayish, with black dots. Lens prominent, adjacent to the hilum.
Flowering in: Mar-Jun.
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