* Flowers yellow.

D. aizoides: dwarf, tufted; leaves sessile, linear, ciliated; flowers few, rather large. - Rocks, rare. Fl. March, April.

** Flowers white.

D. muralis: annual; stem weak, ascending, leafy; lower leaves ovate or oblong, toothed; flowers white with minute entire petals. - Rocks and walls, rare. Fl. April, May.

D. verna: annual; stem dwarf, erect, leafless; leaves radical, ovate or oblong; flowers small, white, with deeply cloven petals. - Walls and dry banks. Fl. April, May.