32 FOSSIL FLORA OF THE SIERRA NEVADA. 
relation as LR. typhinoides bears to R. typhina. The shape of the leaves 
is like that of the specimens from Cuba, whose nervation is, however, 
more oblique to the midrib. The specimens of the cultivated plants of 
the species which I have obtained in great number and finely preserved 
from Key West, show in the direction of the secondary nerves in the 
intermediate veins, in their anastomoses by veinlets of different direction, 
in the multiple bows along the borders, the same characters as in these 
fossil leaves, whose nervation is equally very varied. Sometimes the 
secondary nerves pass to the borders, and enter them mostly by branch- 
lets, and the tertiary parallel veins always irregular, variously distant, join 
them by nervilles, either oblique or in right angle, composing a series 
of simple secondary bows, distant from the borders, to which they are 
united also by nervilles. Sometimes the secondary nerves curve in large 
bows at a greater distance from the borders, as in Fig. 13, and with ner- 
villes in right angle upon their backs compose a second row of festoons 
which follow close to the margins. In Fig. 12 the details of nervation 
are less varied, and more closely resemble those of the living species. 
The leaflets from Cuban specimens are quite as unequilateral as those of 
this fossil species. Those of Florida are more regular, generally round 
truncate, and equilateral. The leaves are indifferently three palmately 
divided or imparipinnate. By the nervation, Celastrus Zacchariensis, Sap., 
of the Miocene of France (St. Zaccharie), is related to this. Its leaves, 
however, are dentate or crenate. 
Habitat.— Table Mountain, Tuolumne County, California. Voy’s Col- 
lection. 
Rhus dispersa, sp. nov. 
Pl. I. Fig. 23. 
Leaflet small, subcoriaceous, lingulate, cuneate to an obtuse point, rounded, subcordate at 
the base ; borders denticulate from the middle upwards ; nervation subcamptodrome. 
This leaflet, of a very small size, one and a half centimeters long, and 
scarcely seven millimeters broad, is evidently detached from a compound 
leaf. Slightly and gradually enlarged upwards from the base, it is rap- 
idly narrowed at the top into an obtuse point, and distinctly though dis- 
tantly denticulate in its upper part. The secondary veins, mostly oppo- 
site, irregular in distance, but parallel, go out from the narrow midrib in 
an open angle of divergence, 50° to 60°, pass straight to very near the 
