Lathyrus vernus

''Lathyrus vernus'' syn. ''Orobus vernus'' , is a species of flowering herbaceous perennial plant in the genus ''Lathyrus'', native to forests of Europe and Siberia. It forms a dense clump of pointed leaves with purple flowers in spring, shading to a greenish-blue with age.

This species and the cultivar 'Alboroseus' have gained the Royal Horticultural Society's Award of Garden Merit.