Flora of Barro Colorado Island

Paspalum conjugatum

Bergius, Acta Helv. Phys.­Math. 7:129, pl. 8.1762

Stoloniferous perennial, 30-100 cm or more tall; culms sometimes decumbent at base, simple or sparingly branched, glabrous; stolons long, leafy. Sheaths longer than the internodes, pubescent on collar, ciliate; blades 8-17 cm long, 5-15 mm wide, usually sparsely pubescent throughout, the margins scabrous or ciliate. Inflorescences terminal, or 2 (rarely 3) racemes (conjugate or nearly so), 7-16 cm long; rachis winged, the margins scabrid; spike­lets ovate, 1.4-2.2 mm long, solitary, short-pedicellate, plano-convex, long-ciliate; first glume and sterile lemma covering fruit. Fruits plano-convex, ovate,   1.4-2.2 mm long. Croat 5854.

Common to locally abundant in clearings. Apparently flowering all year, especially during the late dry season and throughout the rainy season.

Fruits are dispersed by birds and by passing animals, attaching themselves by the long vinous trichomes on the margin of the spikelet. Ridley (1930) reported the tri­chomes to be coated with a viscous substance.

Cosmopolitan tropical weed. In Panama, known from tropical moist forest in the Canal Zone, all along the Atlantic slope, and in Herrera, Panama, and Darien; known also from premontane wet forestin Chiriqui and Panama and from tropical wet forest in Colon.