NO. 2229. FOSSIL PLANTS FROM BOLIVIA— BERRY. 137 



nearly rectangular areolation. The leaflets have the appearance of 

 having had a glaucous surface, but this may be due to their preser- 

 vation. 



This species is based upon material collected by Singewald and 

 Miller and on certain of the leaflets figured by Britton and referred 

 to Cassia chrysocarpoides Engelhardt. Of the latter the form with 

 a pctiolule rcfigured in the present connection may be of another 

 species, but is otherwise indistinguishable. Cassia chrysocarpoides 

 Engelhardt is relatively much shorter and broader with a more pointed 

 tip and with thinner and more curved secondaries. 



It is named for Dr. J. T. Singewald, jr., of the Johns Hopkins 

 University. 



Cotype.—Csii. No. 35092 U.S.N.M. 



CASSIA RIGEDULIFOLIA Engelhardt. 



Plate 16, fig. 1. 



Cassia rigidulifolia Engelhardt, Sitz. Naturw. Gesell. Isia in Dresden, 

 1894, Al.h. 1, p. 10, pi. 1, fig. 34. 



Description. — Leaflets sessile, but slightly inequilateral, obovate 

 in outline, with a retuse apex and a cuneate base. Margins entire, 

 full and evenly rounded. Texture coriaceous. Length about 2.5 

 cm. Maximum width, midway between the apex and the base, about 

 1 cm. Midrib stout and straight, prominent. Secondaries widely 

 spaced, stout, about six pairs diverge from the midrib at wide angles 

 of about 55 to 60°, pursue a nearly straight course two-thirds of the 

 distance to the margin and then arch upward in a broad campto- 

 drome loop. Tertiaries mostly obsolete. 



This species was compared by Engelhardt with the existing Cassia 

 mucronata Sprengel of Brazil, and it is also much like various fossil 

 species referred to Cassia. On the other hand it is much like various 

 existing and fossil species referred to Dalbergia, Gastrolohium, etc. 



CASSIA OBSCURA Engelhardt. 



Cassia obscura Engelhardt, Sitz. Naturw. Gesell. Isis in Dresden, 1894, Abh. 1, 

 p. 10, pi. 1, fig. 50. 



Description. — Leaflets small, sessile, oval in form, with entire mar- 

 gins. Length, 6 mm. Maximum width, at or below the middle, 

 about 5 mm. Apex rounded. Base obliquely inequilateral. Midrib 

 straight. Secondaries, 4 or 5 camptodrome pairs. 



This obscure form is evidently leguminous, but its affinity with 

 Cassia is uncertain. It is not represented in the present collection, 

 nor in that studied by Britton. It was compared by Engelhardt with 

 the existing Cassia rotundifolia Persoon, a widespread form in tropi- 

 cal America which ranges from Mexico and the West Indies to Brazil. 



