Abstract
Recent collections from Puerto Rico have included a heretofore undiscovered species in the large, predominantly tropical genus Vernonia. The new species, V. proctorii in sect. Lepidaploa, subsect. Arborescentes, is a rare element in the shrub forest of the Cerro Mariquita. It is similar to V. albicaulis of Puerto Rico and the Lesser Antilles in capitulescence and involucral features and to V. orbicularis of Cuba in leaf shape. The new species is readily distinguished from the former by its orbicular, sericeous leaves and from the latter by its condensed, cymose capitulescence. For the West Indies, Keeley (1978) counted 42 species of Vernonia Shreber mostly belonging to sect. Lepidaploa (Cass.) DC. subsect. Arbores- centes Ekman, including three species previ- ously known from Puerto Rico. The new taxon described herein, V. proctorii, a fourth Puerto Rican species, is readily attributed to this sub- section because of its shrubby habit, open cy- mose capitulescence, pubescent achenes, and pollen features.
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