KNOWLTON.] PLANTS OF THE PAYETTE FORMATION. 723 



of a specimen from this last locality, as cited above, agrees closely 

 with the one under discussion, but it does not appear to be identical 

 with the Elko specimens. It is likely that on a revision of American 

 fossil Sequoias this will have to be made a new species, unless it can 

 be correlated with some known form. 



Localities: Two miles southeast of Marsh post-office, Boise County; 

 Cartwright's ranch, on Shafer Creek; Idaho City. 



SEQUOIA, Cones of. 



The collection contains a single example, which bears three broken 

 cones that appear to belong to this genus. They are too fragmentary 

 to make an identification of value. 



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

 Idaho. 



JUGLANS HESPERIA n. sp. 



PI. XCIX, fig. 8. 



Leaflet coriaceous, elliptical-lanceolate in outline, unequal-sided at 

 base, probably acuminate at apex (broken); margin finely serrate; 

 petiole short, thick; midrib thick; secondaries numerous, about 

 eighteen pairs, opposite below, alternate above, emerging at a low 

 angle, but curving upward, and running along the border and send- 

 ing weak branches to the teeth; intermediate secondaries numerous, 

 often two between secondaries, either soon lost, or running nearly to 

 the margin; nervilles numerous, mainly percurrent; finer nervation 

 quadrangular. 



This fine species is represented by the single example figured. It 

 is nearly perfect, lacking only the apex. The part preserved is 8 om 

 long and was probably 10 om or ll cm in length when perfect. It is 

 broadest in the middle, at which point it is 3.75 cm in width. It 

 is broadly lanceolate, rounded and unequal-sided at base, and prob- 

 ably acuminate at apex. The margin is finely serrate, with rather 

 obtuse teeth. 



This species is closely related to, if not, indeed, identical with, Jug- 

 lans oregoniana Lx. , from the Chalk Bluffs of California. Almost 

 the only difference is that J. oregoniana is enlarged upward, whereas 

 the one under discussion is narrowed above and enlarged below. The 

 configuration of the base, the serrate margins, and the nervation are 

 very similar. There are, however, no intermediate secondaries in J. 

 oregoniana. On account of these differences, slight though they are, 

 and from the further fact that the material is very scanty, it has been 

 thought best to regard them as distinct, at least for the present. 



Locality : Two miles southeast of Marsh post-office, Boise County, 

 Idaho. 



