FLORA OP THE GREEN RIVER GROUP. 193 



nerves, at an angle of divergence of about 40°, pass toward the borders, 

 slightly curved and obliquely branching, especially near the borders; the 

 nervilles are mostly at right angles to the midrib. Except that the petiole 

 of the leaves is longer, nearly 2 centimeters, and the leaves slightly more 

 enlarged in the middle, the species is, in all its characters, identical with 

 Rhus palceocotinus, Sap., "Et.," ii, p. 352, pi. xii, fig. 6, closely allied to the 

 well-known R. Cotinus, Linn. 



Hub. — Florissant. Princeton Museum, Nos. 783 and 875. 



Rhus coriarioid.es, ep. nov. 



Plate XLI, Fig. 3. 



Leaves odd-pinnate; leaflets narrowly lanceolate, gradually acuminate, narrowed 

 in rounding to the base, sessile; borders distantly serrate; lateral nerves curved, 

 craspedodroine. 



The leaflets are opposite, at least in the upper part of the leaves, 6i 

 centimeters long, 10 to 12 millimeters broad toward the base; the teeth 

 are short, turned upward, gradually smaller toward the apex, where the 

 borders are entire as near the base. The affinity of this species is with 

 Rhus glabra, Linn., of the present North American Flora, and especially 

 with the European R. coriaria, Linn., which merely differs by the larger 

 teeth of the borders. 



Hab. — Florissant. Princeton Museum, No. 858. 



Rhus c a s s i o i cl e s , sp. nov. 



Plate XLI, Fig. 11. 



Leaves trifoliate or odd-pinnate; leaflets obovate, the terminal twice as large as 

 the lateral ones, entire; lateral veins close, 8 to 10 pairs, parallel, curved in passing to 

 the borders, craspedodroine. 



The specimen does not indicate whether the three leaflets figured 

 pertain to an odd-pinnate leaf or to a trifoliate one, the axis or pedicel 

 being broken under the point of attachment of the leaflets. The terminal 

 one is 2h centimeters long, 12 millimeters broad above the middle; the 

 lateral 14 to 15 millimeters long and 6 millimeters broad; the lateral veins, 

 quite distinct, follow close to the borders in their curves and are united 

 by close nervilles at right angles, simple or anastomosing in the middle. 



CF 13 



