Annual herb from a taproot; stems sparsely to densely stiff-hairy, 40-150 cm tall, usually branched.
Basal leaves stalked, mostly somewhat pinnately cleft, with the terminal lobe the largest, to wavy-margined and lobed or saw-toothed; stem leaves similar but reduced upward, the uppermost elliptic, wavy-margined or saw-toothed, nearly unstalked and not ear-like at the bases.
In numerous clusters from the leaf axils; flower stalks stout, erect, 3-6 mm long; petals 7-11 (15) mm long, basal portion slender; sepals 3-4 mm long.
Siliques, erect, tightly appressed to stems, 1-2.5 cm long, 1-1.5 mm wide, somewhat quadrangular; beaks smooth; seeds about 2 mm long, minutely honeycombed.
If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.
Illustration Source: The Illustrated Flora of British Columbia
Synonyms and Alternate Names:
Sinapis nigra L.