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Cyperaceae family

Eleocharis geniculata
(Linnaeus) Roemer & Schultes
, Syst. Veg. 2: 150.  1817.
Bas.: Scirpus geniculatus Linnaeus (1753).

Indigenous quite common herb of shallow pools of water and very muddy spots at lower elevations.
Pantropical.
Grows in clumps. Usually about 10cm. high but can be much taller.