100 THE EVOLUTION OF OUR NATIVE FRUITS 



large and elongated; berries usually not falling singly, but tend- 

 ing to shrivel and hang on the stem; seeds pyriform. 



A. Green-leaved grapes, mostly marked at maturity by absence 

 of prominent white, rusty, or blue tomentum or Bcurf or con- 

 spicuous bloom on the haves beneath (under surface some- 

 times thinly pubescent, or minute patches of floccose wool in 

 the axils of the veins, or perhaps even cobwebby); the foli- 

 age mostly thin: tendrils intermittent, i. e., every third joint 

 hearing no tendrils (or inflorescence). V. cinerea and V. 

 Arizonica are partial except inns, and might be looked for 

 in a \. 



B. Vulpina-like grapes, characterized by thin light or bright 

 green mostly glossy leaves I which are generally glabrous 

 below at maturity except, perhaps, in the axils of the veins, 

 and in V. Champini), with a long or at least a prominent 

 point, and usually long and large, sharp teeth, or the edges 



even jagged. 



c. Leaves broader than hmg, with truncate -oblique base ' . 

 Treleasei might be sought hen- . 

 Vitis rupestris, Scheele. (Sand, Sugar, Rook, Bush, or Mountain 

 Grape.) Shrub 2 to 6 feel high, or sometimes slightly climb- 

 ing, the tendrils few or even none, diaphragms plane and 

 rather thin: Leaves reniform to reniform- ovate (about :! to 4 

 inches wide and two-thirds as high), rather thick, smooth 

 and glabrous on both surfaces at maturity, marked by a char- 

 acteristic light glaucescenl tint, the sides turned up ><> as to 

 expose much of the under surface, the base only rarely cut 

 into a well marked sinus, the margins very coarsely angle- 

 toothed, the boldly rounded top bearing a short, abrupt point, 

 ami sometimes two lateral teeth enlarged and suggesting lob< BI 

 Stamens in fertile flowers recurved laterally or rarely ascend- 

 ing, those in the sterile (lowers ascelldillLT: cluster small, 



slender, open and branched: berries small ',- to '..-inch in 

 diameter), purple-black and somewhat glaucous, pleasant 



tasted, ripe in late summer; BOeds -mall ami broad. — Sarnh 

 banks, low hills and mountains. Distrid of Columbia and 



s. Pennsylvania to Tennessee, Missouri, and s. W r 



One or two varieties in cultivation, ami it hybrid: 



Promising for the experimenter, 



