Flora of Barro Colorado Island

Alternanthera sessilis

(L.) R. Br., Prodr.1:417.1810


Similar to A. ficoideaexcept the petioles 1-5 mm long; the blades to 4 cm long and 1.5 cm wide; the inflores­cences of axillary tufts to 4 mm long; the bracts and bracteoles 1 mm long or less; the sepals 5,1-veined, to 1.5 mm long; the utricles 1.5-2 mm long, slightly ex­ceeding the sepals. Standley 40948.

Perhaps no longer present on the island, but reported by Standley to have been frequent. Probably flowers all year, but especially during the rainy season.

Honduras to Brazil; West Indies. In Panama, the few collections are widely scattered and the plant occasionally extends to aquatic habitats; known from tropical moist forest in the Canal Zone, Bocas del Toro, Los Santo, Panama, and Darien.