Erect, rigid herbs with creeping rootstock,
glabrous or minutely hairy, roots fibrous. Stems angular, sparingly branched.
Leaves sessile, distichous, linear-oblong, pinnately 3-5 nerved. Inflorescence
axillary, subracemose, peduncle filiform, rigid, close to the leaf-midrib,
flowers clustered, very minute, pedicelled, greenish, bracts setaceous.
Perianth campanulate, 4-fid, lobes subequal, ovate, valvate. Stamens 4, united
to the base of the lobes, anthers short, diverging. Ovary half inferior, apex
convex, ovules pendulous, numerous.