Meikle, R.D., Flora of Cyprus 1. 1977
but modified and supplemented
1Siliques flattened, 2.5-4.0 mm wide; leafbase with minute auricles
1'Siliques somewhat compressed, but not conspicuously flattened, less than 2 mm wide; leafbase without auricles
2Plant glabrous or with very scattered hairs only at the base of stem leaves; basal leaf rosette compact; stamens 4 (or rarely more)
2'Plant with scattered hairs on stem and stem leaves; basal leaves not rosulate; stamens 6