Denscantia calcicola (Rubiaceae), A New Species from Limestone Outcrops in the Brazilian Caatinga

Abstract

The first new species of Denscantia from the caatinga biome is described and illustrated. Denscantia calcicola is easily distinguished by its plicate–nerved and scabrous leaves, axillary inflorescences with 7–15 glomerules, calyx tube 0.85–1.2 mm long, bifid stigma and pollen grains with only one endocingulum.La primera especie de Denscantia del bioma caatinga es descrita e ilustrada. Denscantia calcicola se distingue fácilmente por las hojas plegado–nervosas y escabras, las inflorescencias axilares con 7–15 glomérulos, el tubo calicino 0.85–1.2 mm de largo, el estigma bífido y granos de polen con un endocíngulo.