VITACEAE, .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 short buds; 
rounded leaf-scars; no stipule-scars; rather fleshy digitately 
2 -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. 3 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. 
