Bolivian Mimosa (Leguminosae, Mimosoideae): three new species and a species checklist Author Margoth Atahuachi Author M. Leontien Van Der Bent Author John R. I. Wood Author Gwilym P. Lewis Author Colin E. Hughes text Phytotaxa 2016 2016-05-13 260 3 201 222 journal article 10.11646/phytotaxa.260.3.1 42186781-dd9d-418a-ba65-05680906269a 1179-3163 192175 32. * Mimosa orthocarpa Spruce ex Benth The occurrence of Mimosa orthocarpa in Bolivia represents a surprisingly large range extension for a species previously unrecorded from south of the Amazon and known to Barneby (1991) from the Amazon, northern South America and parts of Central America. Several collections ( J.R.I. Wood et al. 22861 , LPB, K, USZ, J.R.I. Wood & D. Soto 27134 , LPB, K, USZ and D. Villarroel et al. 2046 , USZ) from two disjunct localities in Bolivia—ca. 50 km S of Concepcion (Las Trancas and El Encanto), and Cerro Mutún, German Busch—can be attributed here. Mimosa orthocarpa is characteristic of granite rock platforms, particularly in the Lomerio area, a habitat also mentioned by Barneby (1991) in his notes on this species from northern South America. The species is morphologically close to and easily confused with M. tobatiensis Barneby & Fortunato, another species here newly documented for Bolivia (see below). These two species, distinguished by details of leaflet venation, indumentum, and pod shape ( M. orthocarpa with larger, more robust and almost linear pods cf. the slightly falcate chartaceous pods of M. tobatiensis ) and previously considered to be remotely allopatric putative sister species ( Barneby 1991 ), are thus now known to co-occur in Bolivia .