VITACEAE. 73 



Hypogynous disk present, either annular, cup-shaped or glandular : leaf-blades simple 



or ternately compound. 



Petals cohering into a cap, caducous, never separating. 

 Bark shreddy : pith interrupted by diaphragms at the 



nodes : tendrils forking. 1. VITIS. 



Bark not shreddy : pith continuous through the nodes : 



tendrils simple. 2. MUSCADIXIA. 



Petals distinct, spreading. 



Floral envelopes mostly in 4's : disk 4-lobed : plant- 

 tissues fleshy. 3. Cissus. 

 Floral envelopes mostly in 5's : disk entire or nearly so : 



tissues not fleshy. 4. AMPELOPSIS. 



Hypogynous disk wanting or obsolete: leaf-blades digitately 



5-7-foliolate. 5. PAHTHENOCISSUS. 



1. VITIS [Tourn.] L. Leaf -blades palmately lobed, angled or coarsely 

 toothed. Flowers in elongate racemes or panicles. Calyx minute. Petals 

 cohering. Berries juicy, mostly edible. Seeds pyriform. Spr. GRAPE. 



Leaf-blades green and glabrous beneath, at least at maturity. 1. V. cordifolia. 

 Leaf-blades densely woolly, or floccose, or cobwebby beneath. 

 Leaf-blades cobwebby or flocculent beneath at maturity. 



Young foliage gray-cobwebby. 2. V. cinerea. 



Young foliage ferruglneous-pubescent, at least on the 



veins of the leaf-blades. 

 Twigs, and often the expanding leaves, dotted with 



close, felt-like, pubescence. 3. V. austrina. 



Twigs, and often the expanding leaves, more or less 



densely tomentose. 

 Leaf-blades not lobed, except on shoots, the 



margins shallowly sinuate-toothed. 4. V. tiliifolia. 



Leaf-blades usually manifestly lobed, the mar- 

 gins coarsely toothed. 5. V. rufotomentosa. 

 Leaf-blades felt-like, or densely tomentose beneath at 



maturity. 



Leaf-blades felty-tomentose with white hairs beneath. 6. V. coriacea. 

 Leaf-blades densely tomentose with tawny or rusty 



hairs beneath. 7. V. Simpsonii. 



1. V. cordifolia Lam. Leaf-blades thin, deep-green, longer than broad, com- 

 monly ovate in outline, rarely 3-lobed or 3-angled near the apex, rather coarsely 

 and irregularly toothed, glabrous or sometimes sparingly pubescent beneath 

 when young, more or less deeply cordate at the base (persistent and lustrous in 

 V. cordifolia sempervirens) : panicles 1-3 dm. long, commonly drooping: ber- 

 ries globose, 8-10 mm. in diameter, black under a slight bloom. Dleasantly acid, 

 persistent. FROST-GRAPE. CHICKEN-GRAPE. 



Woods and thickets, n. Fla. and the adj. pen. (Cont.) 



2. V. cinerea Engelm. Leaf-blades thinnish, mostly longer than broad, 8-20 

 cm. in diameter, shallowly toothed, otherwise entire, or distinctly angularly 

 3-lobed near the apex, cobwebby above or glabrous and rugose in age, more 

 or less softly pubescent beneath with ashy or dark-brown webby hairs, cordate 

 at the base: panicles 1.53 dm. long, irregular, drooping: berries subsrlobose, 

 10-14 mm. in diameter, black, barely glaucous, rather numerous. DOWNY- 

 GRAPE. 



Hillsides and along streams, n. Fla. (Cont.) 



3. V. austrina Small. Leaf -blades thinnish, orbicular or ovate-orbicular, 

 10-15 cm. in diameter, more or less distinctly 3-lobed, triangular at the apex, 

 finely pubescent beneath and often rusty on the nerves, dull-green above, cor- 

 date, the teeth very low, remote : panicles relatively small : peduncles often 

 about as long as the panicles: berries mostly 6-9 mm. in diameter, black, 

 without a bloom. 



Swamps and low woods, n. Fla. and the adj. pen. 



4. V. tiliifolia H. & B. Leaf-blades ovate to ovate-orbicular, 5-14 cm. long, 

 acuminate, sinuate, with mucronate teeth, dull-green above, finely and closely 

 reddish-floccose beneath, especially rusty on and about the veins, cordate: 



