Eleocharis geniculata (L.) Roem. & Schult. / Heterotypic Synonyms: Eleocharis caribaea (Rottb.) S.F.Blake, it is an annual plants, tufted, without creeping rhizomes. Tubercles stramineous to whitish, umbonate to subconic, 0.2-0.4 × 0.2-0.5 mm, apex rounded to acute. Culms to 45 cm × 0.2-1 mm. Leaves; distal leaf sheaths persistent, firm, distally tightly sheathing, apex acute. Spikelets orbicular to ovoid, 1-9 × 1-4 mm, apex rounded to acute; proximal scale without flower, not amplexicaulous; floral scales to 125, 11-14 per mm of rachilla, tightly appressed, dark red-brown to stramineous, ovate to elliptic, 0.8-3 × 0.6-2(-2.3) mm, membranous to cartilaginous, apex rounded to acute. Flowers: perianth bristles (0-)4-8, typically 7, red-brown, rarely whitish, vestigial to much exceeding tubercle, typically equaling achene, spinules few to dense; styles 2-fid. Achenes brown ripening to black, biconvex, orbicular to obpyriform, 0.5-1.1 × 0.3-0.7 mm, apex rarely constricted proximal to tubercle, very finely reticulate at 40 X.
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