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Perennial herbs with short rhizome. Leaves basal, rarely 1 or 2 distant on the stem, often reduced to the sheaths; Inflorescence paniculate, spike-like to much branched. Stamens 3;


Australasia: S. Asia: present
Small genus (c. 5 spp.), all Australian, one species extending to S. Asia.


Allied to Schoenus and Lepidosperma; Schoenus is mainly characterized by the elongated, prominently zigzag upper internodes of the rachilla and the reduction of the upper flower in the spikelet; Lepidosperma can be recognized by the thick spongy perianth-scales under the fruit and the glabrous nuts.
The circumscription of the genus here accepted is that of BENTHAM in the Flora Australiensis. CLARKE and KÜKENTHAL restricted Tricostularia to 3 extra-Malesian spp., and removed T. undulata and T. paludosa to Cladium, Schoenus, or Costularia, which in my opinion is contrary to their natural relationships.


NEES - in B. & H., Gen. Pl. 3. 1883: 1064
KÜK. - in Fedde, Rep. 53. 1944: 212
BENTH. - in Fl. Austr. 1878: 382
NEES - in Lehm., Pl. Preiss. 2. 1846-1847: 83
PAX - in E. & P., Pfl. Fam. 2. 1887: 115