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1 Upper cauline leaves coarsely and irregularly dentate, the teeth acute to obtuse, sometimes with a mucro or short linear tip < 0.5 mm long; siliques broadly rounded at both ends (when mature – young siliques may be cuneate and acute); plant annual or biennial
1 Upper cauline leaves spinulose-dentate, the teeth acuminate and usually with a linear tip > 0.5 mm long; siliques cuneate at the base, acute at the tip; plant perennial