KNOWLTON.] PLANTS OF THE PAYETTE FORMATION. 731 



portion only is preserved. The leaf appears to have been obovate- 

 lanceolate, extending below into a wedge-shaped base. It appears to 

 have been entire in the lower portion and toothed above. 



Locality: One mile southeast of Marsh post-office, Boise County, 

 Idaho. 



ULMUS SPECIOSA Newby. 



Proc. U. S. Nat. Mus., Vol. V, p. 507, 1883; Plates ined., PI. XLV, fig. 8. 



A single, somewhat fragmentary specimen, but with no doubt this 

 species. 



Locality: Idaho City, Idaho. 



FlCUS UNGERI Lx. 

 Pi CI, fig. 5. 



Lesquereux, Suppl. to Hayden's Ann. Rept. 1871, p. 7 (1872); Tert. Fl., p. 195, PI. 

 XXX, fig. 3; Cret. & Tert. Fl., p. 163, PI. XLIV, figs. 1-3. 



The collection contains three specimens that undoubtedly belong 

 to this species, being especially like fig. 2 of PL XLIV in the Cretaceous 

 and Tertiary Flora. They are of about the size of this, and have the 

 slightly unequal base and identical nervation. 



Locality: Cartwright's ranch, on Shafer Creek, Boise County, Idaho. 



CASSIA OBTUSA n. sp. 

 PL C, figs. 4, 5. 



Leaflet small, of firm texture, elliptical; margin entire, obtuse at 

 apex, obtuse or subcordate at base; petiole short, thick; midrib 

 thick, straight ; secondaries numerous, about 14 pairs, the lowest pair 

 short, nearly at right angles to the midrib, the others alternate, at an 

 angle of 20 to 30, probably curving and anastomosing at their 

 extremities; finer nervation not preserved. 



The two examples figured are all of this species that were contained 

 in the collection. The smaller is about 3.5 cm in length and 1.5 cm in 

 width. It is nearly regularly elliptical in outline, with obtuse base 

 and relatively obtuse apex. The petiole is a little more than l mm in 

 length and is rather thick. The midrib is also thick and carries 

 about fourteen pairs of alternate parallel close secondaries. The 

 other specimen is a little longer, with a subcordate base, but is other- 

 wise similar. 



There seems to be no American ^species with which this can be 

 closely compared, but in the Swiss Tertiary a number of forms 

 approach it quite closely. Thus Cassia phaseolites Heer 1 suggests 

 this, but differs in size and in the fact that it is more wedge-shaped 

 at base and apex. The nervation is quite similar. C. ambigua Heer 2 



i Fl. Tert. Helv., Vol. Ill, PI. CXXXVII, figs. 1-13. 

 "Loc. cit., figs. 29, 32. 



