Monographs Details: Abarema microcalyx var. enterolobioides Barneby & J.W.Grimes
Authors:Rupert C. Barneby
Authority: Barneby, Rupert C. & Grimes, James W. 1996. Silk tree, guanacaste, monkey's earring: a generic system for the synandrous Mimosaceae of the Americas. Part I. Abarema, Albizia, and allies. Mem. New York Bot. Gard. 74: 1-292.
Description:Variety Description - Characters as given in key to varieties [Key: "pod very broad and thick, (11-)15-29 mm wide, and in cross-section ±1-2 mm thick; exterior suture of pod not or obscurely constricted."]; pedicels at anthesis (few seen), 0.5-0.9 mm; pods (11)15-29 mm wide, the grossly thickened valves obscurely venulose, the pitchlike mesocarp 0.9-2 mm thick in section.

Distribution and Ecology - In habitats of var. microcalyx, sometimes surviving in cut-over and cultivated forest, below 100 m, apparently local on the Amazon River and its affluents from the S in E state of Amazonas (Manaus; Maués) and closely adjacent Pará (Itaituba on Río Tapajós), Brazil. — Map 13. — Fl. dates unknown. [Key] "Dispersed in E-centr. Amazon basin, from Manaus SE to the lower Río Tapajós in W Pará;"

Discussion:The var. enterolobioides combines the leaves of Pithecellobium microcalyx sens. str. with the grossly obese pod of P. parauaquarae and occupies an intermediate range of dispersal. The three taxa are conveniently treated as geographic varieties of one species. In external aspect the pod forcibly recalls that of Enterolobium schomburgkii Bentham, whence the epithet.
Distribution:Amazonas Brazil South America| Pará Brazil South America|