About 50 species of annual and perennial grasses from Europe, Asia and temperate S. America. Clump-forming or rhizomatous, they have typical grass leaves and tiny spikelets borne in dense ovoid or cylindrical heads.
On the whole, a genus unsuited to the rock garden, its members being too large, coarse and/or invasive. The one species described may be tried in the rock garden or raised bed, ideally in sandy or gritty soil and full sun to keep it compact. Propagation is by division or seed in spring.