Abstract
Recent expeditions in the Venezuelan Guayana have resulted in additional new taxa in the genus Mendoncia (Acanthaceae). The following is an effort to place these novelties on record for the convenience of other taxonomists prior to the publication of the Flora of the Venezuelan Guayana. Four new Venezuelan Guayana species of Mendoncia, M. steyermarkii, M. neblinensis, M. williamsii, and M. coriacea, are described, illustrated, and compared with their closest relatives.

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