Three new taxa of Guadua (Poaceae : Bambusoideae) from South America

Two new species of Guadua from South America are described, illustrated and compared with putatively related species. The two new species are Guadua macrospiculata from the western Amazon basin in southeastern Colombia, northwestern Brazil, and northern Peru, and G. uncinata front southern Colombia and central-eastern Ecuador. A description of the Brazilian species G. tagoara is included, establishing one new subspecies, G. tagoara subsp. glaziovii from the Atlantic forests of the state of Rio de Janeiro. The empty bracts at the base of the spikelet proper of the pseudospikelet in Guadua are reinterpreted a., sterile lemmas and not glumes.