Books received

Chromolaena ternicapitulata is described from Sierra de Maigualida in T. F. Amazonas and a key to the species of Chromolaena from Guayana is given. Newly documented for the flora of Venezuela are M. aschersonii Hieron. and M. amazonica Baker, the second herein resurrected from the synonymy of common and widespread M. sprucei Baker. Mikania karsteniana Klot. ex Hieron. is not considered synonymous with M. pannosa Baker, thus the latter is again considered to be endemic to Guayana.