Dahlia parvibracteata (Asteraceae, Coreopsideae), a New Species from Guerrero, Mexico

Abstract

Dahlia parvibracteata (Asteraceae, Coreopsideae), a new species from Guerrero, Mex¬ ico, is described and illustrated.It is distinguished by its numerous flowers on terminal or axillary stems, either borne singly on long peduncles or on short-branching naked stems held above the fo¬ liage, and by its narrowly spatulate to oblong-lan¬ ceolate outer involucral bracts.This species falls within the natural range for the genus, and is mor¬ phologically closest to D. moorei, although there are distinct differences.