202 DESCRIPTION OF SPECIES. 



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

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

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

 the leaflet, contracted near the apex into a short obi use acumen, is different 

 hi >iri any of the European species. A fragment only of a seed referable to 

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

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



Hah.— Florissant. U. S. Geol. Expl. Dr. F. V. Hayden. 



Podog-onium ^.uiericanuni, Lesqx. 

 IS Geol. Rep," vii.p. 298, pi. lix, fig. 5; lxiii, fig 2; lxv, fig. 6. 



CASSIA, Linn. 



Cassia Fisclieri, Heer. 

 " l'l. Tert. Helv ," iii, p. 119, pi. cxxxvii, figs. 62-63 



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. 

 Lcguminosites serrulatus, sp. nov. 



Plate XXXIX. Figs. 7,8. 



Leaves trifoliate, long-petioled, membranaceous ; leaflets 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. 



Leguiniiiosites alter uaiis, Lesqx. 

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



