NO. 2229. FOSSIL PLANTS FROM BOLIVIA— BERRY. 139 



elongated form and more pointed apex and base. It differs from 

 Dalbergia chartacea Engelhardt and Sweetia tertiaria Engelhardt in 

 the same particulars, and there are minor differences in the venation. 

 Plesiotype. —Cat. No. 35097, U.S.N.M. 



CASSIA LIGLSTKINAFORMIS, new name. 



Plate 16, figs. 7, 8. 



Cassia Kguslrinoides Engelhardt, Sitz. Naturw. Gesell. Isis in Dresden, 1887, 

 Abh. 5, p. 37, pi. 1, fig. 16; 1894, Abh. 1, p. 10, pi. 1, fig. 27.— Britton, 

 Trans. Amer. Inst. Min. Eng., vol. 21, 1893, p. 252, figs. 21, 22, 24, 25, 46-48, 

 63 (?), not figs. 23, 26, 27, 1893; (not Schrank, Denks. Akad. Muench., vol. 

 6, 1816, p. 179. 



Description. — Leaflets sessile, inequilateral, lanceolate in outline, 

 with a pointed nearly equilateral tip and a slightly blunter pointed, 

 inequilateral base. Margins entire, evenly rounded. Texture sub- 

 coriaceous. Length ranging from 3.5 to 5.5 cm. Maximum width, 

 midway between the apex and the base, ranging from 9 mm. to L5 cm. 

 Midrib mediumly stout, generally curved, not especially prominent. 

 Secondaries thin but prominent, numerous; about 10 opposite to 

 alternate pairs diverge from the midrib at angles averaging about 45° 

 and are camptodrome. Tertiaries thin but well marked. 



This is a common and characteristic form in the Potosi collections 

 much like numerous previously described fossil species and many 

 still existing species of this large genus, especially the existing Cassia 

 ligustrina Liimaeus after which it was named. It is also found at 

 Corocoro. Britton has referred several forms to this species which 

 fall beyond its limits of variation, and this is especially true of the 

 small petiolate leaves shown in his figures 26 and 27. Engolhardt's 

 name is preoccupied by Schrank, 1816. Cassia is abmidant and 

 varied at Potosi being represented by no less than 10 species. Cassia 

 cJirysocarpoides Engelhardt is much shorter and wider, Cassia cris- 

 toides Engelhardt is a much smaller spatulate form, Cassia wendtii 

 Britton i,s very much smaller and oblong elliptical in form, Cassia 

 singewaldi Berry is a broadly elliptical form. Cassia rigidvlifolia 

 Engelhardt is a large retuse form, Cassia obscura Engelhardt is a very 

 small obscure form, and Cassia mernhranacea is very similar to tlie 

 present species, but with slightly wider thinner leaves with more 

 numerous secondaries. 



Plesiotypes.— Cat. Nos. 35135, 35136, U.S.N.M. 



CASSIA CULTRIFOLIAFORMIS, new species. 



Plate 16, fig. 9. 

 Description. — Leaves bifoliate. Leaflets inequilateral obovate, 

 coriaceous, with a widely rounded apex and a gradually narrowed 

 sessile base. Margins entire. Texture coriaceous. Length aljout 

 1 cm. Maximum width, above the middle, about 4 to 5 mm. The 

 upper margin is nearly straight, the outer margin is full and rounded. 



