34 FOSSIL FLORA OF THE SIERRA NEVADA. 



under this name, but not described in the Prodromus. The relation is 

 rather in the size and form of the leaflets than in the nervation, which 

 in the Brazilian plant is analogous to that of Rhus mctopium, but with a 

 punctate areolation. In the fossil floras our species is distantly compar- 

 able to Z. integrifollum, Heer, Fl. Tert. Helv., III. p. 86, PI. CXXVII. 

 Figs. 27-30. 



Habitat. — Bowen's Claim, Oregon, in connection with Quercus Boweniana, 

 and fragments of Acer vitifolium. Voy's Collection. 



JUGLANS, Linn. 



Juglans Californica, sp. now 



PI. IX. Fig. 14. PI. X. Figs. 2, 3. 



Leaves targe, entire, oblong-oval, obtuse, narrowed >>r rounded to the base; secondary 

 veins numerous, inequidistant, on an open angle of dirert/enee, i-amptodrome. 



Nothing more can be observed of these leaves than is represented by 

 the figures. They are referable to the Juglans of the type of J. regia, 

 Linn., so widely known in cultivation, and spontaneous only in Asia. 

 We do not have it in America, wdiere even by cultivation it fails to 

 give evidence of prosperity. As the type is extremely common in the 

 Miocene of Europe, where it is represented by numerous species, some 

 of them varieties of the most common one, J. acuminata, Al. Br., and as 

 we have the same species also common in the North American Tertiary, 

 the fossil form of the California Chalk Bluffs may be considered as prob- 

 ably the last representative of this type upon the North American Con- 

 tinent. In the different appearances of its leaves, their form, their open 

 nervation, their shape, this species is related to J. acuminata var. latifolia, 

 Heer, Flor. Tert. Helv., III. p. 88, PI. CXXIX. Figs. 2-8. They are 

 generally narrower, more evidently broadly obtuse or taper pointed, rather 

 than abruptly acuminate. It is the only difference. The great variety 

 of the leaflets of the same species of Juglans may render advisable the 

 reference of these of the Californian Pliocene to Heer's species. 



Habitat. — Chalk Bluffs, Nevada County, California. Voy's Collection. 



