and tapering triangular apex, 1-2 dm. long above petiole, slightly less wide, the 

 basal sinus either narrow or broad, with irregular usually smallish and shallow 

 apiculate or short-mucronate teeth, either unlobed or with short shoulders or (more 

 rarely) with 2 or 4 prolonged lobes, the upper surface floccose but becoming gla- 

 brate, the pale-green or somewhat glaucous lower surface canescent-pilose or 

 grayish-floccose with cobwebby hairs, the looser hairs somewhat deciduous; petiole 

 shorter than the blade, canescent or floccose; thyrse slender, 6-15 cm. long, canes- 

 cent or gray-floccose, rather open; grapes 4-9 mm. in diameter, blackish or 

 purplish, with a slight bloom, finally sweet; seeds 4-5 mm. long. 



River and creek banks, in marshes, about lakes, bottomlands and pond margins 

 in Okla. (Waterfall) and n.-cen. to s.e. Tex., fruiting Sept.-Nov.; from Fla. to 

 Tex., n. to Va., O., Ind., 111., la. and Neb. 



Those plants with suborbicular-cordate very shallowly toothed leaves that lack 

 the triangular or 3-lobed aspect of var. cinerea and whose lower surface is promi- 

 nently soft-pubescent or densely canescent instead of being cobwebby and/ or floc- 

 cose are referred to var. canescens Bailey. 



2. Vitis aestivalis Michx. Summer grape, pigeon grape. 



High-climbing vine; young branchlets and petioles with rusty or reddish persistent 

 to flocculent-deciduous tomentum or velutinous pilosity; diaphragm 3-4 mm. thick; 

 leaves of fertile branches suborbicular-ovate, cordate, 7-20 cm. long from top of 

 petiole, about as broad as long, the basal sinus mostly deep and prominent, the 

 margins irregularly and not deeply sinuate-toothed and the teeth often sharp, 

 unlobed or merely shouldered to deeply 3- or 5-lobed, upper surface dull-green and 

 essentially glabrous, lower surface with subpersistent but loose and flocculent 

 tomentum of cobwebby hairs, the prominent ribs and veins tomentose to velutinous- 

 hispid; thyrse 5-18 cm. long, the axis with cobwebby hairs; grapes 5-12 mm. in 

 diameter, dark-purple or blackish, with a thin bloom, persistent, variable in quality 

 and taste, sometimes sweet and pleasant-tasting; seeds 5-7 mm. long, 4-5 mm. 

 broad. 



In sandy soils mostly along rivers and streams in the e. third of Tex. and Okla. 

 {Waterfall), fruiting Sept.-Oct.; from Ga. to Tex., n. to Mass., N.Y., O., Mich, 

 and Wise. 



3. Vitis riparia Michx. Riverbank grape, frost grape. 



Vigorous high-climbing vine; new branchlets green or dull-red, glabrous or 

 pubescent and glabrate; diaphragm 0.8-2 mm. thick; leaves of fertile branches with 

 glabrous petioles, 8-18 cm. long from a petiole, about as broad as long, cordate- 

 ovate, with a prolonged acuminate apex, with a broad open basal sinus, the margins 

 with coarse acuminate teeth and usually conspicuously ciliate, glabrous or glabrate, 

 with 2 or more erect and prolonged lobes 1-4 cm. long; leaves of vegetative sprouts 

 similar or more deeply palmate-lobed; thyrse 4-15 cm. long, its axis and branches 

 sparsely and loosely long-pubescent to glabrous or essentially so; grapes crowded, 

 8-12 mm. in diameter, purple-black, with heavy bloom, acid; seeds about 5 mm. 

 long. V. vulpina of auth. 



On trees and cliff's in open woodlands, in alluvial soils along streams and in 

 canyons in the Trans-Pecos, e. to n.-cen. Tex., Okla. {Waterfall) and (?) N.M., 

 fruiting Aug.-Oct.; from Que. to Man. and Mont., s. to Tenn., Mo., Tex. and N.M. 



4. Vitis palmata Vahl. Missouri grape, red grape, catbird grape. 



Slender high-climbing vine; shoots and flowering branchlets herbaceous, angled, 

 bright-red when fresh; diaphragm 4-5 mm. thick; stipules 3-4 mm. long; tendrils 

 red when young; leaves of fertile branches thin, ovate, long-acuminate, 7-12 cm. 

 long above petiole, about as broad as long, with a broad open sinus to almost trun- 



1110 



