Taxonomic Novelties in Sapranthus (Annonaceae): a new large-sized species endemic to the mountain cloud forest of Central America

Abstract

AbstractSapranthus (Annonaceae) is a Neotropical genus comprising ten small tree species, most of which inhabit the tropical dry forests of Mexico and Central America. Morphological characteristics of these species are quite variable and taxonomically informative, but the morphological affinities among them have not been studied. A multivariate cluster analysis was carried out to infer the morphological affinities among all species of Sapranthus, and to establish the position of a new species, S. pinedai, a shade tree used in the coffee plantations of Guatemala and El Salvador. This new species, illustrated and described herein, is recognized by a unique combination of features identified through comparisons with morphologically similar taxa, and a preliminary assessment of the conservation status of the new species was calculated. The results presented here show that Sapranthus forms four morphological groupings in two main clusters. The new species is more similar to S. microcarpus and S. campechianus, but differs from both species by its essentially glabrous leaves, short pedicels, fewer carpels, greater number of ovules per carpel, biseriate ovules, larger sessile fruits with a thick testa, and by its several lunate to wedge-shaped seeds. These morphological groupings provides new insights into the understanding of the sectional classification of the genus Sapranthus, the geographic distribution of its species, and the morphological affinity of the new species.