202 • DBSCKIPTION OF SPECIES. 



The small leaflet, a lillle more than 4 centimeters long and 1 broad, has 

 the peculiar nervation of species of this genus, especially like that of P. 

 lafifolmm, Heer, "Fl. Tert. Helv.," pi. cxxxvi, figs. 10-21. The form of 

 the leaflet, contracted near the apex into a short obtuse acumen, is difi"erent 

 from any of the European species. A fragment only of a seed referable to 

 this genus has been found, probably at the same locality, being labeled 

 Middle Park, a name often used for leaves from Florissant. 



Zr«5.— Florissant. U. S. Geol. Expl. Dr. F. V. Ilai/den. 



Podo^onium Americanum, Lesqx. 



"U. S G™I. Rep," vii,p. 298, pi. lix, fig. 5; Ixiii, fig 2; Ixv, fig. 6. 



CASSIA, Linn. 



Cassia Fischeri, Heer. 



" Kl. Tert. Helv ," iii, p. 119, pi. cxxxvii, figs. 62-6."> 



Leaflets membranaceous, petioled, ovate-lanceolate, acuminate ; secondary nerves 

 at an acute angle of divergence. 



These leaves, with the shape, size, and nervation of this species, are 

 acuminate, like fig. 64 of Heer. 



Hab. — Florissant. Lacoe"s Collection, No. 42. 



LEGUMINOSITES. 



Licg-Hiiiincsi tes seiTulatu.s, sp. nov. 



Plate XXXIX, Figs, 7,8. 



Leaves trifoliate, loiigpetioled, membranaceous ; lealicts narrowly lanceolate, 

 sessile, and serrulate; secondary nerves obsolete. 



The leaflets are long and narrow, the lateral a little shorter than the 

 terminal, largest in the middle, tapering upward, acuminate or pointed 

 and gradually narrowed to the base. The relationship of these leaves is 

 unknown to me. 



Ilab. — Florissant. Princeton Museum, Nos. 784 and 785. 



Leguininosites alteriians, Lesqx. 

 Hayden's ''Ann, Rep," 1874, p. 315. 



