84 DESCRIPTION OF SPECIES. 



divided leaf, with leaflets alternate, short petioled, more enlarged on one 

 side near the base. The fragments of leaflets distributed on the same 

 piece of coarse shaly sandstone indicate their original connection with a 

 pinnate leaf. The lower part of the stem does not bear any fragments of 

 the base of other leaflets attached to it. The stone is coarse, the nerva- 

 tion is obscure and has no trace of subdivisions of the secondary veins. 

 The leaflets average 12 to 14 centimeters in length, 2h to 3 centimeters in 

 width in the broadest part below the middle. 



Hab. — Near Morrison, Colorado. H. C. Beckwith. 



Fragments of what I consider a variety of this species have been sent 

 by Chs. Sternberg to the Museum of Comp. Zool., Cambridge, from Ells- 

 worth County, Kansas (Nos. 24, 37). These represent two leaflets only, 

 both unequal at base, one about the same size as the specimens from 

 Morrison, merely differing by the lateral veins being a little more oblique; 

 another leaflet is shorter and has the veins open proximate. It has been 

 found also at Atane with S. prodromm, Heer, "Fl. Arct.," iii, p. 117, pi. 

 xxxiv, which it resembles. 



FRANGULACE^E. 



CELASTROPHYLLUM, Ett. 



Celastroph yllum eiisi folium, Lesqx. 

 "U. S. Geol. Kep.," vi, p. 108, pi. xxi, figs. 2, 3. 



ILEX, Linn. 

 Ilex strangulata, Lesqx. 



Plate III, Fig. 7. 

 Hayden's " Ann. Rep.," 1674, p. 359, pi. vii, fig. 8. 



Leaf coriaceous, narrow, pauduriform or strangled in the middle to a small angu- 

 lar lobe, rounded at base in narrowing to the petiole, entire in the lower part, little 

 enlarged and irregularly distinctly obtusely dentate in the upper; secondary veins 

 proximate, in a very open angle of divergence, irregularly camptodrome or mixed. 



This leaf is about 5 i centimeters long (point broken) without the li 



centimeter long petiole. The general outline of the leaf is lanceolate, but 



it is narrowed in the middle, as by erosion, nearly to the medial nerve, 



and gradually enlarged upward by undulations or successive large obtuse 



irregular teeth. The surface is rugose; the lateral nerves, mostly camp- 



