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Seeds flat or flattish, orbicular or oval; cotyledons accumbent or nearly so.

The radicle r is folded on the edges of the cotyledons c which are accumbent.

Seed of Bitter Cress, Barbarea, cut across to show the accumbent cotyledons.

Seeds in 2 rows in each cell, rounded, broadly winged; cotyledons accumbent; radicle short.—A low annual, with once or twice pinnatifid leaves and leafy-bracteate racemes of yellow flowers.

Cotyledons accumbent, flattened, equal or nearly so, petiolate.—Mostly glabrous perennials, leafy-stemmed, growing along watercourses and in wet places.