136 rROCEEDINGS OF THE NATIONAL MUSEUM. vol.54. 



Tliis species, represented by several specimens from Potosi, is 

 much smaller, more falcate, and relatively more slender than the 

 associated Enierolohium grandifolium Engelhardt. Among the asso- 

 ciated forms it approaches closest to Machaerium eriocarpoides Engel- 

 hardt, in which, however, the leaflets are straighter, relatively wider, 

 lanceolate instead of linear, the petiolulc is longer, and the second- 

 aries are less obsolete and more ascending. 



Enterolohium parvifolium may be compared with the existing 

 Enierolohium scliomhurgkii Bentham, which ranges from Panama to 

 Brazil, and which it greatly resembles. I have figured an exces- 

 sively falcate leaflet, the majority are less falcate and more like the 

 specimen figured by Engelhardt.* 



Plesiotype.—Qmt. No. 35093, U.S.N.M. 



Family CAESALPINIACEAE. 



Genus CASSIA Linnaeus. 



CASSIA SINGEWALDI, new species. 



Plate 15, figs. 32-34. 



Cassia chrysocarpoides Brixton (not Engelhardt), Trans. Amer. Inst. Mining 

 Eng., vol. 21, 1893, p. 252 (part), figs. 30-33 (not figs. 29, 34, 35). 



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 peti- 

 olule is present in some of the leaflets that it has not been found pos- 

 sible to differentiate 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, at or above 

 the middle, ranging from 1.4 to 1.75 cm. Midrib stout, prominent 

 on the underside of the leaflet. Secondaries relatively stout; about 

 12 pairs diverge from the midrib at angles of from 40 to 70°, being 

 more ascending in the narrower more obovate leaflets, and less ascend- 

 ing in the elliptical leaflets or in the fuller side of the leaflets. The 

 secondaries are approximately evenly spaced and subparallel: they 

 are for the most part rather straight in their courses and are campto- 

 drome in the marginal region. The tertiaries are thin, but well 

 marked, as shown in the figures, forming an open polygonal or often 



I Sitz. Naturw. Gesell. Isis ia Dresden, 1894, Abb. 1, p. 12, pi. 1, fig. 61. 



