Isachne soderstromii sp. nov. (Poaceae, Micrairoideae, Isachneae) from Dominica, Lesser Antilles

Isachne soderstromii, a new species from Dominica in the Lesser Antilles, is described and illustrated. The new species can be recognized by the combination of the following features: distichous leaves, blades with conspicuous midrib, panicle branches and pedicels with glandular bands, and glabrous rachilla between the lower and the upper similar anthoecia. The new taxon is compared with morphologically related Central American and Caribbean species of the genus. Additionally, a key to the species of Isachne occurring in Central America and the Antilles is provided.