COROCORO COPPER DISTRICT OF BOLIVIA 99 



America and found from the West Indies and Central 

 America to Brazil. Except for the two species recorded 

 from Corocoro and Potosi it is unknown in the fossil state. 

 Enterolobium grandifolium is readily distinguished from 

 the associated small, falcate, slightly petiolulate, Enter o- 

 lobium parvifolium. It is somewhat like the broader forms 

 referred by Engelhardt to Acacia uninervifolia as well as 

 similar to Mimosites engelhardti Berry and Macharium 

 eriocarpoides Engelhardt. It is, however, somewhat larger 

 than these, falcate and much more inequilateral, and 

 usually readily discriminated. 



Family 



Genus Cassia LINNE 

 Cassia singewaldi BERRY 



Cassia chrysocarpoides Britton (not Engelhardt), Trans. Amer. 

 Inst. Mining Eng., vol. 21, 1893, p. 252 (part), figs. 30-33 (not figs. 

 29, 34, 35)- 



Cassia Singewaldi Berry, Proc. U. S. Natl. Mus., vol. 54, p. 136, 

 pi. 15, figs. 32-34, 



Description. Leaflets obovate to elliptical in outline with 

 a broadly rounded equilateral or nearly equilateral tip and 

 a markedly inequilateral base, which is somewhat variable 

 in outline. In some leaflets one margin narrows almost 

 straightly, while the other is broadly rounded; in others 

 both margins are full and that on one side resembles half 

 of the base of a cordate leaflet; and every gradation 

 between these two extremes are present. Margins entire, 

 generally slightly undulate. The leaf substance is not 

 thick, but the leaflets appear stiff and subcoriaceous in 

 texture. A short expanded petiolule is present in some of 

 the leaflets that it has not been found possible to dif- 

 ferentiate from this species by means of any other char- 

 acters, but the majority are sessile with an expanded base 

 of the midrib. 



Length ranging from 3.3 to 3.5 cm. Maximum width, 



