120 THE LATER EXTINCT FLORAS OF NORTH AMERICA. 



imperfect, apparently represent Lesquereux's Z. cinnamomoides. These are 

 ovate or ovate-lanceolate in outline, and yet may be only a variety of the 

 species described above. They differ, however, widely from the descrip- 

 tion of Z. cinnamomoides of Lesquereux. 



Formation and locality : Tertiary (Green River group). Green River, 



Wyoming. 



Order VITACE.E. 



VlTIS EOTUNDIFOLIA Newb. 



PL LI, fig. 2, in part ; LIII, fig. 3. 



Proc. IT. S. Nat. Mus., Vol. V (March 21, 1883), p. 513. 



"Leaf broadly rounded or sub-triangular in outline, cordate at the 

 base, and with an acute point at the summit, and at the extremity of each 

 of the angles; intermediate portions of the margin coarsely and bluntly 

 toothed; strongly three-nerved; tertiary nervation distinct and nexuous." 



Collected by Captain Howard. 



The general aspect of this leaf is but imperfectly given in the 

 drawings, inasmuch as the strength of the nervation has been somewhat 

 exaggerated, but the leaf was apparently thicker and with stronger nerva- 

 tion than in most of the vines. % 



Among living species it bears the strongest resemblance to V. labrusca, 

 but is less distinctly angled and more strongly dentate on the margin. 

 Professor Heer has described three species of Vitis that occur in the arctic 

 regions, V. Olriki (Fl. Foss. Arct., Vol. I, p. 120, PL XL VIII, fig 1), 

 V. arctica (op. cit., PI. XLVIII, fig. 2), and V. Islandica (op. cit., p. 150, 

 PI. XXVI, figs, le, If, 7a), but all these had leaves which were more 

 elongated triangles in form and of lighter structure. 



Formation and locality: Tertiary (Miocene). Admiralty Inlet, Alaska. 



Order TILIACE^E. 



Grewia crenata (Ung.) Heer. 

 PL XLVI, fig. 2; XLVIII, figs. 2, 3. 



Fl. Tert, Helv., Vol. Ill (1859), p. 42, PL CIX, figs. 12-21; OX, figs. 1-11. 

 Dombeyopsis crenata Ung., Gen. et Sp. PL Foss. (1850), p. 448. 



Formation and locality: Tertiary (Miocene). Bridge Creek, Oregon. 



