Abstract
Psidium acutangulum has been previously understood as a widespread and variable species. Here, it is proposed that populations east of the Andes should be divided into two species: P. acutangulum and P. acidum based on characters of the leaves, anthers, fruits and seeds. The new combination Psidium acidum is made here and the species is described, illustrated and contrasted with P. acutangulum and P. friedrichsthalianum. Psidium acutangulum as now understood remains variable and seems to be related to a mainly Amazonian group of species. Populations from western Ecuador, once thought to belong to P. acutangulum are now considered a new species.
Resumen
Psidium acutangulum se ha entendido previamente como una especie muy extendida y variable. Propongo que las poblaciones al este de los Andes se deben dividir en dos especies, P. acutangulum y P. acidum basado en características de las hojas, las anteras, los frutos y las semillas. La nueva combinación Psidium acidum se hace aquí y la especie esta descrita e ilustrada; se compara con P. acutangulum y P. friedrichsthalianum. Psidium acutangulum como se entiende ahora sigue siendo variable y parece estar relacionado con un grupo de especies principalmente amazónico. Las poblaciones del occidente de Ecuador, que antes se incluia en P. acutangulum, ahora se consideran una nueva especie.
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Acknowledgments
I thank James Solomon at MO for allowing me to borrow specimens of this complex for a second time when my ideas had changed. I thank the staff of NY for kindly sending photographs of some specimens I had previously annotated but needed additional review. The numerous collections of Psidium being made by personnel at HOXA (Oxapama, Peru) and sent to me through MO have stimulated this study. Specimens cited here have come from the following herbaria: ASU, CAS, F, GUAY, M, MICH, MO, NY, UB, USM, QAP, QCA, QCNE, R, and USM. Martius’ Latin description of Psidium acidum used here was copied from the Global Plants Initiative website where it appears transcribed accompanying an image of the type. Xavier Cornejo kindly sought out P. friedrichsthalianum in a fertile state in Esmeraldas to confirm that it grew there. Antonio Morschbacker sent me photos of cultivated P. acidum from Santa Catarina, Brazil and provided valuable information about its distribution in cultivation. I thank M. Ibrahim and C. Parra-O. for offering helpful suggestions on an early version of this paper; Parra also found a duplicate specimen of P. acidum at USM. I am grateful to M. L. Kawasaki and F. R. Barrie who have provided helpful reviews of this manuscript.
