Closely related to F. acuminata. Stems very slender, setaceous, spreading to decumbent, 5-20 cm by ¼ mm. Leaves often all reduced to sheaths, but frequently some with well developed, filiform, acute, ½ mm wide blades scabrid on the margins near the top. Spikelet narrowly lanceolate, pale green, 4-6 by 1-1½(-2) mm. Glumes membranous, the lower ones oblong, the upper ones oblong-ovate. Stamens 1-2; anthers linear, c. 1½ mm. Style very slender, distinctly dilated at the base, c. 2¼ mm long, 1/10 mm wide. Nut obovate, white or pale stramineous, ¾-9/10(-1) by ½-⅔(-4/5) mm.
In open wet localities: edges of swamps, wet grass-fields, damp places in savannah-forests, trails in secondary forests, also on the sea-shore, at low altitudes, rarely up to 800 m.
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