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Spikelets crowded into a leafy-involucrate head, laterally flattened, the scales more or less conduplicate and keeled.

Glumes 2, chartaceous, strongly flattened laterally or conduplicate, awnless, bristly-ciliate on the keels, closed, nearly equal in length, but the lower much broader, enclosing the flat grain.

In these cases the cotyledons are plane; but they may be folded upon themselves and round the radicle, as in Mustard, where they are conduplicate, thus o>>.

Seeds spherical and cotyledons conduplicate, as in Brassica.—Annuals or biennials.

Scales imbricated somewhat in 2 ranks, more or less conduplicate or boat-shaped, keeled, white or whitish.