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In black mustard, racemes of yellow flowers arise from the tip of the stems, with the siliques (fruit) of previously fertilized flowers arrayed along the stem below the flowers. The racemes of flowers are 1/2-2" long. Each flower is about 1/3" (8 mm) across, consisting of a short (2-4 mm) pedicel, 4 sepals (green in the buds, turning yellow after the flower opens), 4 yellow, oval to round petals with a narrow base ("claw"), 6 greenish-yellow stamens with yellow anthers, and a green ovary with a short style (which persists in the siliques) at its apex. Fertilized flowers produce smooth, elongate fruits (siliques) 2-3 mm across, approximately four-angled in section, and 1/2-1" long, tapering to a conical or cylindrical beak with the remnant of the style at its tip. The siliques contain 4-15 seeds and are often closely appressed to the stem. The seeds are dark brown or black with networks of furrows on their surface.

Brassica

Brassica nigra

black mustard [Blooms: Jun-Jul]