Rhus. TEREBINTHINEZ. 29 
TEREBINTHINE. 
RHUS, Linn. 
Rhus typhinoides, sp. nov. 
Pl. IX. Figs. 1-6. 
Leaves pinnate, leaflets opposite, distant, small, short-petioled, lanceolate, acutely taper- 
pointed or acuminate ; borders serrate; secondary veins numerous, parallel, at an 
open angle of divergence, camptodrome. 
It seems at first as if these leaves, which are represented by numerous 
specimens, might be referable to two different species, one with unequi- 
lateral leaflets, the other with more equal ones gradually narrowed to 
the petiole, as Figs. 1 and 5. The difference is evidently the result of 
the lateral or terminal position of the leaflets, as distinctly seen from the 
lower fragment of Fig. 1. The nervation is the same, and the denticu- 
lation of the borders is merely more or less enlarged, according to the 
size of the leaflets. It is easy to recognize the close affinity of the fossil 
species to Jhus typhina, Linn., the staghorn Sumach, so frequently seen 
on the eastern slope of North America. There is a difference, however, 
in the generally longer linear leaflets of the living species, in the more 
marked or larger denticulations of the borders, and in the more open 
angle of divergence of the lateral veins, which are less regularly camp- 
todrome, more generally entering the teeth by their points than by 
branching veinlets. I find, however, among the specimens of LR. typhina 
some leaflets where these deviations or differences are scarcely notice- 
able. The consistence. of the fossil leaflets, though not coriaceous, is firm, 
somewhat thick. In the fossil species of hus this one is comparable to 
R. oblita, Sap., and R. derelicta, Sap., both of the Miocene of France, com- 
pared by the author to Rhus typhina, to which, however, they are less 
intimately allied than ours. 
Habitat. — Table Mountain, Tuolumne County, California. Voy’s Col- 
lection. 
Rhus Boweniana, sp. nov. 
Pe DX, lige... 85. 9. 
Leaves pinnate; leaflets unequilateral, oblong-oval, obtusely pointed ; secondary veins 
numerous, parallel ; borders distantly obscurely denticulate. 
