236 DESCRIPTION OF SPECIES. 



which is not uncommon in Alaska. The leaflets are not as large as those 

 of Carya antiquorum, Newby., the nervillcs more distant and flexuous, the 

 teeth of the borders stronger and more acute. 



/y«6.— Bad Lands of Dokota. Professor Wm. Benton. 



J u g 1 a II s W (> o <1 i a n a , Heer. 



"Foss. Fl. of Vancouver," p. 9, pi. ii, figs. 4-7. 



Leaflets large, obloug-lauceolate, acuminate, creuate-serrate on the borders; 

 lateral nerves oblique, abruptly curving at a distance from the borders, following them 

 in simple series of areoles ; uervilles very flexuous, distant, branching and anastomos- 

 ing at right angles; areolation loose. 



This species is easily separated from the former by the coarse obtuse 

 irregular teeth of the borders, the curves of the lateral nerves, which are 

 more abrupt and more distant from the borders, and the large irregularly 

 quadrate divisions of the areas. 



Hob. — Bad Lands. Professor McBrides Collection. 



Carya antiquoriini, Newby. 

 "U. S. Geol. Kep ," vii, p. 289, pi. Ivii, figs. 1-5; Iviii, fig. 2. 



Hah. — Yellowstone Valley. Professor N. II. Winchell. 

 ANACARDIACE^. 



RHUS, Linn. 



" U. S. Geo!. Rep.," vii, p. 291. 



Rhus Win ell ell ii, sp. nov. 



Leaves ternate ; leaflets sessile, ovate-lanceolate, acute, the lateral unequilateral 

 at the rounded base, the terminal gradually narrowed to the base ; nervation pinnate ; 

 secondary nerves open, close together, parallel, slightly cur%ing in passing to the bor- 

 ders, where they are abruptly camptodrome. 



This leaf is closely related to Rims hella, Heer, "Fl. Arct.," ii, p. 482, 

 pi. Ivi, figs. 3-5, differing especially by the lateral leaflets being rounded 

 at the base, not narrowed, shorter, and the nervation much closer and 

 strongly marked. The substance of the leaves is subcoriaceous. 



Ilah. — Yellowstone Valley. Professor N. H. WincheU's Collection. 



