THE FLORA OV THE SAINT EUGENE SILTS 



413 



apparently, each species representing a flora distinct from the 

 other, either stratigraphic or regional. 



Order EHAMNALES 



Family Vitaceae 



Genus Vitis Linnaeus 

 Vitis alia n. sp. 



Plate 43, figure 1 



"Vitis n. sp. !" Hollick, Summary Rej^t. {loc. cit.), l^. 135. 



Leaf about 11.5 centimeters in length by about 13.5 centi- 

 meters in maximum width, obscurely trilobate, deeply cordate 

 at the base; margin coarsely and sharply dentate; nervation 

 3-palmate from the base, craspedodrome ; lateral primaries sub- 

 tending angles of about 45° with the midrib, profusely branched 

 from the under sides, the basilar branches similarly branched 

 from the under sides; main secondary nerves five on each side, 

 subtending acute angles with the midrib, irregularly spaced and 

 disposed, curving slightly upAvard and recurved as they termi- 

 nate in the marginal dentitions. 



This leaf resembles certain of the individual leaf forms of 

 our existing native grapes, such as Vitis riparia Michaux, V. 

 cordifolia Michaux, and V. aestivalis Michaux. It appears to be 

 somewhat unequal-sided, one of the lateral primaries being 

 curved inward toward its extremity and subtending a slightly 

 more acute angle with the midrib than the other one, which latter 

 is more divergent and almost straight distally. 



It also appears to resemble the Eocene Tertiary species, Vitis 

 olriki Heer,^' originally described and figured in connection with 

 a specimen from Greenland, and subsequently identified by Les- 

 quereux,^** from deposits of approximately equivalent age in 

 Wyoming. In view, however, of the incomplete condition of our 

 specimen it would be useless, and possibly misleading, to infer 

 anything more than a resemblance to the general type of leaf 

 which is represented by both the existing and the extinct species 



3" Heer, Oswald. Flora fossilis aretiea, vol. 1, p. 120, pi. 48, fig. 1. 1868. 

 38 Lesquereux, Leo. U. S. Geol. Survey Terr., Eept. vol. 7 (The Tertiary flora), 

 p. 241, pi. 41, fig. 8. 1878. 



