VITACEAE. 187 



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

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

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



Leaf-blades glabrous or nearly so. 

 Leaf-blades not glaucous beneath. 



Leaves with merely coarsely toothed blades, scarcely lobed. 



Bushy vine : leaf -blades mostly less than 10 cm. long : berries sweet. 



1. V. rupestris. 

 High climbing vine : leaf-blades mostly over 10 cm. 



long : berries sour. 2. V. cordifolia. 



Leaves with prominently 3-5-lobed blades. 3. V. vulpina. 



Leaf-blades glaucous beneath. 4. V. bicolor. 



Leaf-blades woolly or copiously pubescent beneath. 



Lower surface of the leaf-blade loosely tomentose : berries 



8-10 mm. in diameter, not murky. 5. V. aestivalis. 



Lower surface of the leaf -blade felty-tomentose : berries 15- 



20 mm. in diameter, murky. 6. V. Labrusca. 



1. V. rupestris Scheele. Stems 1-2 m. tall: leaf -blades commonly broader 

 than long, reniform to ovate-reniform, 4-10 cm. in diameter, coarsely toothed 

 and rarely slightly, and sometimes somewhat irregularly, lobed, and with an 

 abrupt tip at the apex, mostly lustrous above, glabrous or sparingly pubescent 

 on the veins beneath, somewhat glaucescent on both sides: panicles 2-10 cm. 

 long, slender, not dense: berries subglobose, 7-14 mm. in diameter, purple- 

 black, somewhat glaucous, pleasant-tasted. W. Occasional, along the river 

 at Collin's Ferry. Limestones. Spr. SAND-GRAPE. SUGAR-GRAPE. 



2. V. cordifolia Lam. Stems greatly elongate: leaf -blades thin, deep-green, 

 longer than broad, commonly ovate in outline, rarely 3-lobed or 3-angled near 

 the apex, rather coarsely and irregularly toothed, glabrous or sometimes 

 sparingly pubescent beneath, more or less deeply cordate at the base: panicles 

 1-3 dm. long, commonly drooping: berries globose, 8-10 mm. in diameter, 

 black under a slight bloom, pleasantly acid, persistent. Common, in thickets 

 and woods. Early sum. FROST-GRAPE. CHICKEN-GRAPE. 



3. V. vulpina L. Leaf -blades thin, commonly longer than broad, 5-20 cm. 

 broad, mostly sharply 3-lobed and coarsely and irregularly toothed, glabrate or 

 pubescent on and about the nerves beneath, cordate or nearly truncate at the 

 base, the teeth and lobes acuminate: panicles 6-20 cm. long, often much 

 branched: berries globose, 8-10 mm. in diameter, very dark with a copious 

 bloom, the pulp sour. S. Islands of the Susquehanna, and on the river 

 hills. Schists. Early sum. EIVERSIDE-GRAPE. FROST-GRAPE. 



4. V. tricolor Le Conte. Leaf -blades thinnish, mostly longer than broad, 1-3 

 dm. in diameter, 3-5-lobed, shallowly toothed, glabrous above, glaucous and 

 glabrous beneath or the veins sparingly pubescent, or dull-green at maturity: 

 panicles 5-10 cm. long, commonly long-peduncled : berries globose, 10-14 mm. 

 in diameter, black beneath the bloom, rather sour but pleasant-tasted. W. S. 

 Occasional, in woods, and on islands and river hills. Sandstones and shales, 

 schists. Early sum. SUMMER-GRAPE. BLUE-GRAPE. WINTER-GRAPE. 



5. V. aestivalis Michx. Leaf -blades varying from broader than long to longer 

 than broad, 1-3 dm. in diameter, angularly or deeply 3-5-lobed, shallowly 

 toothed, dull-green and glabrate above, more or less densely, often unevenly, 

 tomentose beneath, with rusty or brown hairs, cordate; petioles usually gla- 

 brous: panicles 1-2.5 dm. long, often conspicuously elongate and rather simple: 

 berries globose, 8-10 1 mm. in diameter, black, under a bloom, with a tough 

 skin, and pulp varying from sweet to very astringent. Common, in thickets 

 and woods. Early sum. SUMMER-GRAPE. PIGEON-GRAPE. 



6. V. Labrusca L. Leaf -blades thickish, suborbicular to broadly ovate, mostly 

 longer than broad, shallowly toothed or scalloped, otherwise entire, or 3-lobed 

 near the apex, becoming glabrous above, densely tomentose beneath: panicles 

 5-12 cm. long, usually simple: berries globose, 1.5-2 cm. in diameter, amber 



