PUOCENK PlSLLYI'AMPA BOLIVIA 175 



leaflets at considerable elevations in eastern Bolivia which 

 Dr. Britton considered as probably new to science. The 

 genus is a large one in the existing flora, with upwards of 

 400 described species, and probably many additional and 

 still to be described. It is found in the warmer temperate 

 and tropical regions of all of the continents, and is especially 

 abundant in tropical America. The Bolivian species are 

 numerous, and several extend upward to altitudes of 11,000 

 feet in favorable situations in the montana valleys. 



There are also many described fossil species dating from 

 the late Upper Cretaceous to the present. The Cassia pod 

 associated with this and the following species of leaflet al- 

 though described under a separate name, may represent the 

 fruit of this or the following species. 



Cassia coriacea Berry, sp. nov. 

 PLATE VI Fig. 5 



Leaflets small, sessile, elliptical in form, nearly equilateral 

 in outline, about equally rounded at the apex and base. Mar- 

 gins full, evenly rounded. Texture extremely thick and cor- 

 iaceous. Length about 1.75 cm. Maximum width, in the 

 median part of the leaflet, about 1.25 cm. Midrib stout, 

 prominent, curved. Secondaries few, stout, remote; four or 

 five camptodrome pairs diverge from the midrib at wide 

 angles. The tertiaries are obsolete. 



Only a single specimen was collected of this characteristic 

 species which is entirely distinct from the other forms found 

 at this locality. There is considerable resemblance to the 

 Pliocene leaflets from Potosi, Bolivia, described by Engel- 

 hardt 19 as Cccsalpinia gmchlingi, but the two are not iden- 

 tical. The present fossil is similar to the leaflets of several 

 existing species of Cassia of a variety of habitats. 



19 Engelhardt, H., Sitz. Naturw. Gesell., Isis in Dresden, 1894, abh. 

 i, p. 9.. pi. i, fig. 29. 



