K0.2229. FOSSIL PLANTS FROM BOLIVIA— BERRY. 141 



more so and at times the lamina is slightly narrowed distad. Margins 

 entire, full and evenly rounded, the lamina on one side about 1 mm. 

 wider than on the opposite side. Texture subcoriaceous. Length 

 about 2.8 cm. Maximum -^ndth, midway between the apex and the 

 base, about 1.6 cm. Petiolule when present stout, about 1.5 mm. 

 long. Midrib rather stout and prominent, nearly straight. Second- 

 aries regularly spaced, subopposite to alternate; about 10 pairs 

 diverge from the midrib at angles of about 45° to 50°, curve regularly 

 upward in a subparallel manner and are camptodrome. Tcrtiaries 

 thin, arched in the marginal region and largely percurrent internally. 

 Areolation indistinct. 



This well marked species is sparingly represented in the present 

 collections but appears to have been abundant in some of the earlier 

 collections. It is very close to the existing Cassia clirysocarjm 

 Desveaux of Brazil and Guiana. Among the numerous fossil species 

 of Cassia described from Potosi the only one liable to be confused 

 with the present species is Cassia memhranacea Engelhardt, a thinner, 

 narrower, more elongated and more pointed form. Similar species 

 in other genera are Dalbergia chartacea Engelhardt, which is narrower, 

 more elongated, and more pointed, and Sweetia tertiaria Engelhardt, 

 which is more narrowed distad and with more numerous straighter 

 secondaries. 



Plesioty pe.—C&t. No. 35099, U.S.N.M. 



CASSIA FRANCKEI (Engelhardt). 



P%ZZi<cs/rancte' Enolehardt, Sitz. Naturw. Gesell. Isis in Dresden, 1887, Abh. 5, 

 p. 38, pi. 1, fig. 12; 1894, Abh. 1, p. 13.— Britton, Trans. Amer. Inst. Min. 

 Eng., vol. 21, 1893, p. 258, fig. 61. 



Description. — Leaflets sessile, lanceolate in outline, falcate, with an 

 acute apex and a cuneate base. Margins dentate, entire toward the 

 base. Length about 5.5 cm. Maximum width, at or below the mid- 

 dle, about 1.4 cm. Midrib stout, curved. Secondaries numerous, 

 thin, ascending, camptodrome. 



This species was based upon incomplete material described from 

 Potosi by Engelhardt and not represented in the other collections. 

 Engelhardt referred it to the noncommital form-genus Phyllites, but 

 called attention to its resemblance to the existing Cassia dentata 

 Vogel of the Brazilian tropics. This resemblance is so very great 

 that I have ventured to refer this form to the genus Cassia. 

 Genus CAESALPINIA Linnaeus. 



CAESALPINIA GMEHLINGI Engelhardt. 



Plate 16, fig. 14. 



Caesalpinia gmehlingi Englehardt, Sitz. Naturw. Gesell. Isis in Dresden, 1894, 

 Abh. 1, p. 9, pi. 1, fig. 29. 



Description. — An elliptical sessile leaflet, nearly equilateral, with 

 entire margins. Length about 1.4 cm. Maximum width, in the 



