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1 Stems densely pubescent throughout with simple hairs; sepals pubescent, the hairs flexuous; petals white (fading to purple); upper segment of fruit 1-2-seeded; fresh plants not scented
1 Stems glabrescent, or more hairy only towards the base; sepals glabrous or pubescent (if pubescent, the trichomes straight); petals yellow; upper segment of fruit seedless; fresh plants strongly mustard-scented.
2 Leaves mostly basal or very low-cauline; plant annual or biennial; siliques lacking a gynophore (stipe) between the sepal scars and the base of the valves; [section Anocarpum]
2 Leaves mostly cauline; plant perennial, becoming somewhat woody at the base; siliques with a 0.5-2 mm gynophore (stipe) between the sepal scars and the base of the valves; [section Diplotaxis]