VlTACEAE. 133 



Cissus. "Marine Ivy." 



Woody plants climbing by coiling tendrils, with rather 

 succulent sympodial branches with pale continuous rounded 

 pith not diaphragmed at the nodes ; alternate ^hort buds ; 

 rounded leaf-scars ; no stipule-scars ; rather fleshy digitately 

 3-foliolate leaves ; small greenish perfect polypetalous flowers 

 in repeatedly forking clusters opposite the leaves ; and small 

 purplish large-seeded berries. 

 Leaves fleshy, mostly of 3 coarsely toothed leaflets. C. incisa. 



VITIS. Vine. Grape. 



Decidious sympodial shrubs climbing by coiling branched 

 tendrils opposite the leaves ; with typically shredding brown 

 bark ; soft brown wood with large diffused ducts and coarse 

 medullary rays ; moderate terete twigs ; small rounded con- 

 tinuous brown pith typically with firmer plates at the nodes ; al- 

 ternate somewhat raised roundish or U-shaped leaf-scars with 

 about 5 bundle-traces ; long narrow stipule-scars ; round-ovoid 

 sessile buds with several exposed scales ; rather large long- 

 petioled palmately-veined or lobed leaves ; perfect or unisexual 

 polypetalous small and inconspicuous but fragrant flowers in 

 large compound panicles opposite the leaves ; and small or 

 moderate 4- to' 6-seeded berries. 



1. A tendril or flower-cluster opposite each rusty-woolly 



leaf. (Hybrids of, and) V. Labrusca. 



No tendril or flower-cluster at each third node. 2. 



2. Bark not flaking: pith not firmer at nodes. V. rotundifolia. 

 Bark flaking : pith with firm plates at the nodes. 3. 



3. Twigs angular, persistently gray-pubescent. V. cinerea. 

 Twigs rounded, glabrate. 4. 



4. Leaves woolly beneath when young. 5- 

 Leaves not woolly, bright green. 6. 



5. Leaves green beneath. V. aestivalis. 

 Leaves whitened beneath. V. bicolor. 



6. Leaves scarcely lobed. V. cordifolia 

 Leaves sharply lobed. 7. 



