6 FOSSIL FLORA OF THE SIERRA NEVADA. 
current; the areolation obsolete, the surface coarse, the substance not thick, 
rather membranaceous, 
This species has not any marked relation with any fossil one. By the 
nervation, and somewhat also by the form of the leaves, it is allied to 
Q. castanea, Willd., of the present flora of North America, but still more 
to a section of Mexican Oaks, whose coriaceous leaves are bordered with 
short distant teeth: @Q. Humboldti, Q. glaucescens, Humb. and Bonpl., Q. 
spicata, Kunth., ete. 
Habitat. — Chalk Bluffs. Voy’s Collection. 
Quercus Boweniana, sp. nov. 
Pi. II. Fags. 5, 6. 
Leaves coriaceous, rather small, oblong, lanceolate, pointed or acuminate, gradually curv- 
ing to a short petiole; borders obscurely and distantly dentate ; secondary veins 
parallel, simple, craspedodrome. 
The smallest of the two leaves which represent this species is five cen- 
timeters long, comprising the short petiole, and one and a half centimeters 
broad; the other is about twice as large; their form is elliptical oblong, 
narrowed in the same degree toward the point or short acumen (broken), 
and to the petiole, which is scarcely two millimeters long, and slightly 
inflated. The borders, distantly and obscurely. dentate, are entered by 
the points of the secondary veins, which are simple, equidistant, parallel, 
more or less open, according to the size of the leaves, straight or curv- 
ing very little in passing to the borders. The areolation, observable only 
upon the fragment of the larger leaf, is formed by subdivisions, generally 
in right angle of the fibrille, and composed of very small quadrangular 
meshes. 
These leaves have a distant relation to those of the following species, 
but none known as yet to any from the European Tertiary. 
Habitat.— Bowen's Claim. Voy’s Collection. 
Quercus distincta, sp. nov. 
Pl, IT, Figs Tee, 
Leaves somewhat thick, or subcoriaceous, of lurger size than those of the former species, 
long petioled, ovate, rounded to the petiole and entire toward the base, distantly 
obscurely dentate above, gradually narrowed to an obtuse point; secondary veins 
distant, subcamptodrome. 
