Herbs, terrestrial or among or on rocks, caulescent or without evident stems, occasionally stoloniferous. Leaves rosulate, straight to falcate; blade narrowly triangular, margins spinose. Inflorescences lateral [terminal or lateral], many-flowered, simple or compound and paniculate; branches capitate to lax and elongate; floral bracts broad [broad to narrow], conspicuous. Flowers dimorphic, functionally unisexual, staminate and pistillate on different plants; sepals distinct, symmetric; staminate petals distinct or appearing briefly connate basally from adnation of filaments to adjacent petals; stamens included or exserted; filaments adnate [free or adnate] to petals; pistillate petals distinct, triangular or ovate; ovary largely superior to largely inferior. Capsules ovoid, dehiscent. Seeds narrowly winged to almost wingless, plumose appendages absent.
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