Perennials with thick nodulose horizontal rhizomes. Leaf tips acuminate, subulate. Lower bract ±membranous to subherbaceous. Inflorescence umbelloid or anthelate, composed of capituliform dense large clusters, on ±suberect peduncles. Seeds broadly ovoid, large, 1.7–1.9 × 1.3–1.4 mm, with apical and basal patches of looser outer seed-coat; appendages absent; base distinctly fibrillate.