Studies in the pendulous-flowered species of Rustia (Rubiaceae, Condamineeae), including a new species, Rustia schunkeana

During a revision of the genusRustia, the two pendulous-flowered taxa,R. secundiflora andR. splendens, are here lectotypified and found to be synonymous. Examination of specimens identified asR. secundiflora have revealed an additional pendulous-flowered species:R. schunkeana. A key to the four species ofRustia with pendulous flowers is provided.