Abstract
Recent collecting activity in montane cloud forests of western and central Panama has led to the discovery of two new species of Tessmannianthus, a little-known genus of trees previously recorded from Colombia, Ecuador, and Peru. Tessmannianthus carinatus and T. gordonii are described, illustrated, compared, and contrasted with similar species. A key to the new taxa and a synoptic history of the genus are also provided.

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