Vitis 



VlTACEAE 



663 



50 



Map 1379 



Vitis aestivalis Michx. 



50 



Map 1381 



Vitis vulpina L. 



a northern form of Vitis aestivalis and is separated from it by the less 

 dense pubescence and glaucous color of the under surface of the leaves. 

 Since my specimens show all degrees of intermediates between the two 

 extremes I think this variety is merely a form of the species and I have 

 grouped them on one map. We have this form from the Ohio River to Lake 

 Michigan but it becomes progressively more frequent toward the northern 

 part of the state. 



3. Vitis cinerea Engelm. Sweet Winter Grape. Map 1380. This 

 species is usually associated with Vitis aestivalis from which it was not 

 formerly separated. It is more common in the southwestern counties and 

 in rather sandy soil. Pepoon's report from Lake County should be 

 referred to Vitis Labrusca. (Rhodora 35: 302. 1933.) 



Va., sw. Ohio to Nebr., southw. to Fla., La., and Tex. 



4. Vitis vulpina L. Rhodora 41: 431-434. 1939.) (Vitis cordifdlia 

 Michx.) Frost Grape. Map 1381. Throughout the state although we have 

 no specimens from the extreme northwestern part. This species prefers 

 the open and is commonly found in dry soil along fences. 



I measured a specimen in Perry County, that was 9 inches in diameter 

 at breast height. 



N. Y. to Nebr., southw. to Fla. and Tex. 



5. Vitis palmata Vahl. Catbird Grape. Map 1382. This species is 

 local and has been found in only Knox, Gibson, Posey, and Montgomery 

 Counties on the low borders of sloughs and ponds. It is usually associated 

 with buttonbush. 



In the Mississippi Valley from Ind. to La. and Tex. 



6. Vitis riparia Michx. (Vitis vulpina of Gray, Man., ed. 7 and Britton 

 and Brown, Illus. Flora, ed. 2.) (See Rhodora 41: 431-434. 1939.) 

 Riverbank Grape. Map 1383. Throughout the state. Although we have 

 few specimens from the unglaciated area, it occurs there at least along the 

 Ohio ^iver. It prefers alluvial soil. 



