140 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 54. 



Venation thin; several fine primaries diverge from the base at acute 

 angles and take a subparallel course, forking at intervals and fre- 

 quently inosculating to form narrow elongate meshes that give the 

 leaflet the appearance of close set parallel veins, ultimate loops camp- 

 todrome along the margin. 



This handsome and well-marked species is scarcely to be disting- 

 uished from the existing Cassia cultrifolia Humboldt, Bonpland, and 

 Kunth of the northern South American Tropics, differing merely in 

 the character of the base, which is narrowly cuneate instead of equil- 

 ateral. It may also be compared with the existing Cassia hifoliol'ia 

 with which the differences are more obvious. It is also very similar 

 to the existing Acacia crassifolia A. Gray, but smaller and less 

 expanded. 



Holotype.— Cat. No. 35098, U.S.N.M. 



CASSIA CRISTOroES Engelhardt. 



Plate 16, figs. 10, 11. 



Cassia cristoiWcs Engelhardt, Sitz. Naturw. Gesell. Isis in Dresden, 1887, Abh. 5, 

 p. 37, pi. 1, fig. 13.— Britton, Trans. Amer. Inst. Min. Eng., vol. 21, 1893, 

 p. 252, figs. 40-43 (not fig. 44). 



Description. — Leaflets sessile, but slightly inequilateral, elongate 

 obovate in outline, with a broadly rounded or slightly emarginate 

 apex and a cuneate base. Margins entire. Texture subcoriaceous. 

 Length ranging from 2.5 to 3 cm. Maximum width, in the Tniddle 

 part of the leaflet, ranging from 8 to 11 mm. Midrib stout and 

 prominent. Secondaries thin, numerous, ascending, camptodrome; 

 eight or nine subopposite to alternate pairs diverge from the midrib 

 at regular intervals at angles of about 45° and sweep upward sub- 

 parallel. 



This species is comparable with the existing Cassia crista Jacquin 

 which ranges from the West Indies and Central America to Brazil. 

 Except for the truncated or emarginate apex it is much like the 

 associated Cassia wendtii Britton. It belongs to the same group 

 of leaflets as Cassia ligustrinaformis Berry, Cassia singewaldi 

 Berry, Cassia membranacea Engelhardt and Cassia chrysocaryoides 

 Engelhardt. The emarginate forms are much like the refuse Cassia 

 rigiduUfolia Engelhardt in outline but differ strikingly in venation. 

 It is also much like Platyj^odium potosianum Engelhardt in form, 

 but larger and sessile instead of petiolulate. 



CASSIA CHRYSOCARPOIDES Engelhardt. 



Plate 16, figs. 12, 13. 

 Cassia c^r?/socarpo2(7^s Engelhardt, Sitz. Naturw. Gesell. Isis in Dresden, 1887, 

 Abh. 5, p. 37, pi. 1, fig. 15; 1894, Abh. 1, p. 9, pi. 1, fig. 30.— Britton, Trans. 

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



Description. — ^Leaflets sessile or short petiolulate, slightly oval or 

 ovate in form, the two ends nearly equally rounded, the apex slightly 



