Three species of Rustia Klotzsch (Rubiaceae, Cinchonoideae) were previously known from Peru, R. rubra Standl. ex D. R. Simpson, R. schunkeana Delprete, and R. viridiflora Delprete. A fourth species from the Kosñipata Valley (Cuzco Department), R. kosnipatana S. Will & C. M. Taylor, is newly described and illustrated here. This tree species differs in its inflorescences with erect pink flowers, fusiform flower buds, and corollas with dense pubescence in the throat and the lobes longer than the tubes. This is the first record of Rustia in the southern zone of Peru.
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