Flora of Barro Colorado Island

Paspalum virgatum

L., Syst. Nat. ed. 10, 855. 1759

Cabezona

Robust perennial, l-2 m tall, growing in dense, isolated clumps; culms stout, unbranched, erect. Sheaths longer than the internodes, the lower ones often purplish, the collar and margins glabrous or sparsely hirsute; blades 30-75 cm long, 6-25 mm wide, nearly glabrous but with scabrous margins. Inflorescences 15-30 (40) cm long, of few to many thick racemes, the racemes to 15 (20) cm long; rachis winged, with a tuft of long trichomes at the base, the margins scabrous; pedicels flattened, the margins scabrid; spikelets obovate, paired, crowded, plano-convex, 2.2-3 mm long, often purplish; first glume lacking; sec­ond glume and sterile lemma covering fruit, glabrous or short-appressed pubescent and the margins with longer trichomes especially near the apex. Fruits chestnut-­brown, 2-2.7 mm long, minutely striate. Croat 10244.

Infrequent, in clearings, especially in the Rear # 8 Lighthouse Clearing and on Burrunga Point. Flowering throughout the year, principally in the rainy season.

Texasand Mexico to Brazil; West Indies. In Panama, known from tropical moist forest in the Canal Zone, Bocas del Toro, San Blas, Panama, and Darien, from premontane wet forest in Colón, Chiriqui, and Panama, from tropical dry forest in Panama (Taboga Island), from tropical wet forest in Bocas del Toro and Colón, and from lower montane wet forest in Chiriqui.