The Genus Wittmackanthus (Rubiaceae)

Open Access
Publisher Website
Google Scholar
Abstract
The name Wittmackanthus is accepted as the correct generic name for Pallasia Klotzsch, a later homonym. Assignment of the genus to tribe Cinchoneae, next to Calycophyllum, is supported by the combination of vertically imbricate ovules and alate seeds. Previous authors assigned the genus to tribe Rondeletieae, having misinterpreted the placement of the ovules and seeds as horizontal and both as exalate. One species is recognized, W. stanleyanus, occurring in Panama, Colombia and Guyana, and its variability is discussed.