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Black medic flowerheads are ball-shaped, 1/4-3/8" across, and composed of 10-30 yellow flowers, each about 1/8" long; the flowerheads arise from leaf axils and have a 1-2" long peduncle. Individual flowers are pea-like with the upper petal (the standard) not grooved and oriented perpendicular to the lower component (the keel); the two lateral petals partially cover the keel. The flowers are very similar to those of least hop clover (Trifolium dubium), but that species has a grooved standard that is bent over to act as a hood over the keel.

Medicago

Medicago lupulina

black medic [Blooms: May-?]