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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.


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