Lathyrus clymenum L., it is an annual herb, up to 30-80 cm, glabrous, winged, climbing stems. Lower leaves simple, linear-lanceolate, the middle and upper ones with 2-4 pairs of linear or elliptical-oblong leaflets, with branching tendrils, stipules lanceolate. Purpurine flowers with blue wings, quite large (15-20 mm), 2-5 on peduncles equal to or exceeding the leaf, standard longer than the wings, with 2 bumps at the base, aristated style. Pods up to 55 mm long, glabrous, often pigmented, dorsally carinated, provided with (4–)6–8 seeds. Seeds 3.9 – 4.71 x 3.75 – 3.85 x 3 – 3.25 mm, slightly compressed, ocher-brown, finely dotted with black, variable in shape depending on their position in the pod: ±quadrangular in outline, those located in the middle due to the pressure exerted by the adjacent seeds; ± broadly ovate-truncated at both ends. Densely papillose surface. Thread 1.75–2.5 x 0.3 mm, linear, with a well-defined ridge around it, only interrupted at the micropillar end, occupying c. 1/5 of the circumference of the seed. Lens noticeable, prominent, brown in color, with the central elevation located 0.75–0.9 mm from the thread. The seeds turn dark quickly as they age.
Flowering in: Mar-May.
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