Flora of Barro Colorado Island

Setaria vulpiseta

 (Lam.) R. & S., Syst. Veg. 2:495.1817

Large perennial, l-2 m tall; culms in large clumps, erect or geniculate and rooting at lower nodes, glabrous. Sheaths longer than the internodes, glabrous to densely pubescent, especially along margins; blades 25-50 cm long, 2-3.5 cm wide, scabrous especially on underside of veins and on margins. Panicles 15-30 cm long, often spikelike, dense, the axis densely villous; bristles 1 or 2 below each spikelet, l-2 cm long; spikelets 2-3 mm long, glabrous; first glume about half as long as spikelet; second glume slightly longer than the first; sterile lemma equaling fruit. Fruits transversely rugose, minutely green-crested, white. Croat 11717.

Rare; growing on steep, eroded, lakeside banks south of Fairchild Point, and less often in clearings and at the edge of the forest. Flowering and fruiting from June to December, principally from August to October.

Southern Mexico to Argentina; West Indies. In Pan­ama, known from tropical moist forest in the Canal Zone, Bocas del Toro, San Blas, Panama, and Darien, from tropical dry forest in Panama (Taboga Island), and from premontane moist forest in Panama (Saboga Island).