DESCRIPTION OF SPECIES— CUPULIFERvE. 159 



Quercus Vibiirui folia, Lesqx. 



Plato XX, Figs. 11, 12. 



Quercus attenuataT, Goepp., Lp8()X., Annual Report, 1873, p. 398 



Qucrcua triangularis, Goepp., Lescix. (in part). Annual Report, 1872, p. 377. 



Leaves oval-oblong, narrowed and broadly cuneato downward to a slender petiole and npward to 

 a short point; borders distantly dentate; nervation pinnate, craspedodromo. 



Except for the character of denticulation of the borders, the leaf in fig. 

 11 is quite as similar to Q. attenuata, Goepp. (Tert. Fl. v. Schoss., pi. viii, fig. 

 4), as that of fig. 12 is to Q. triangularis of the same work (pi. vi, figs. 

 13—17). The first of tliese leaves of ours (iiffers by the distant, short teeth 

 of the borders, turned upward and mostly simple, while Goppert's leaves are 

 doubly dentate, with very small teeth turned outside. The second leaf (fig. 

 12) has, as seen in the upper part of the left side, small, simple teeth, agree- 

 ing in characters with those of fig. 11, while Goppert's Q. triangularis has 

 undulate borders. In all these leaves, the general outlines and the nervation 

 are the same, and they evidently refer to the same genus. But, considering 

 its slender, apparently long petiole, the relation of these leaves to the species 

 of the German author, or even to Quercus, seems uncertain. Count Saporta 

 considers them as rather representing a Viburnum. Indeed, they have some 

 affinity to V. inarginatum of pi. xxxviii, figs. 1—5, of this volume, their relation, 

 especially with fig. 2, being more appreciable. As in the species from Black 

 Buttes, that of Golden shows a cuneate base, lower secondary veins opposite, 

 emerging a little above the border base of the leaves, branching outside, all 

 the nerves aiul primary branches entering the short teeth, and a broadly 

 angular top, as wide as in V. marginatum, at least as it is in the leaves of figs. 

 2 and 3 {Joe. cit.). There is a great ditference, however, in the thin, more 

 distant, secondary veins of this species, and in the general outlines of the 

 leaves. These vary in size from four to nine centimeters long and from three 

 and a half to six centimeters broad in the middle, where they are widest, 

 their shape being rhomboidal ; the petiole of the largest leaf is one and a 

 half centimeters long to the point where it is broken; the angle of divergence 

 of the veins, 40°, is the same in both leaves, as is aLso the number of the sec- 

 ondary veins in comparison to the size, the smaller leaf having four pairs 

 only, and the large five, all slightly curving in passing up to the borders. 



Habitat. — Sand Creek, Colorado {A. R. Marvine), Golden, Colorado, 

 and Black Buttes, Wyoming. The specimens from Black Buttes are upon 

 burned red, very hard clay-shale, where the vegetaljle organs have been 

 somewhat obliterated by heat. They are, however, identifiable. 



