VITIS 



149 



a. 



Bark of main stem and branches 

 shreddy and exfoliating, without 

 distinct lenticels;pith with firm 

 diaphragms at the nodes; tendrils, 

 when present, forked 



b. Branchlets bearing a tendril or 

 inflorescence at each node 



b. Tendrils (or inflorescences) 

 intermittent, usually lacking at 

 each third node 



c. High- climbing lianas 



d. Branchlets bluish-glaucous 

 d. Branchlets not glaucous 



e. Nodal diaphragms thin, 

 0. 8-2 mm. thick 



e. Nodal diaphragms 2-6 

 mm. thick 



f. Branchlets pubescent 



g. Branchlets terete 

 g. Branchlets angled 



f. Branchlets glabrous 



1. V. labrusca 



3. V. argentifolia 



4. V. riparia 



2. V. aestivalis 

 6. V. bailey ana 



5. V. vulpina 



c. Low, bushy and spreading; 

 tendrils absent, or only at tips 

 of fruiting branches 



a. Bark of main stem and branches close, 

 not exfoliating; lenticels abundant; pith 

 continuous, without diaphragms at the 

 nodes: tendrils unbranched 



7 . V. rupestris 



8. V. rotundifolia 



1. V. labrusca L. Northern Fox Grape . High climbing or 

 trailing, often ascending high trees, sometimes forming a stem 

 3. 5 dm. in diameter; twigs and tendrils densely rusty-puberulent 

 when young, becoming less so in winter; panicle little branched. 

 Thickets and borders of woods, Maine to Michigan,, south to Ken- 

 tucky, Tennessee, and Georgia (Fig. 212). 



2. V. aestivalis Michx. Summer Grape. Pigeon Grape . A 

 vigorous high-climbing vine with medium or short internodes and 



