VITIS ARTZONICA 
V. arizonica Canyon Grape. Low, scarcely climbing, the tendrils mostly per- 
ishing if not attached to support, the internodes short: leaves rather small, 
broad-ovate with wide open sinus, usually only indistinctly lobed if at all, cob- 
webby when young: fruit about 1/3 inch across, black. West Texas to California 
and Mexico. 
Hortus Second, 1941. 

Vitis arizonica, Engelmann, in Am. Nat. 2, pp 321 and 268 

Synonyms: 
V. aestivalis, var. Gray, Pl. Wright 2, 27 
V. aestivalis, Torrey, Pac. R. Rep. 7,9 
Plant: In specimens from western Texas on the Rio Grande and Arizona, weak, 
much branched, like V. rupestris, little climbing, slender, tapering rapidly, 
angled when young, and cottony, remaining so first season, obscurely striated, - 
still less than in V. rupestris. Growing tips slightly or not at all enveloped 
in expanding leaves. The gray cottony hairs upon the leaves give the entire plant 
a dull ashy appearance. 
Roots: Slender, wiry, little transversely wrinkled, in one year seedlings 
axial, tapering from collar downward. 


Wood: Mature bark dark, almost black, cracks after first year and separates 
into thin, fragile, non-fibrous plates; mature wood very dense and hard; nodes 
searcely at all enlarged, mostly straight, diaphragm 1/12",- about the same as in 
V. rupestris,— biconcave; buds small, but large proportionately to branch, globose, 
whitish, wooly both when dormant and expanding; tendrils mostly once or twice 
forked, small, about the same length as leaves, cottony, deciduous first year if 
not clinging to some support, then holds weakly; internodes very short, 3" to pin 
long. 
Leaves: Stipules 1/12" to 1/16" long, thinly cottony. Petiole half as long 
as the blade is wide, cylindrical, distinctly or faintly grooved on upper side, 
faintly striate, usually pubescent and cottony; like the tendrils and young wood, 
dark red when young appearing dull under the cotton, set at acute or right angle 
with blade; blade 14" to 4" wide by same in length; generally beautifully and 
regularly cordate, sometimes slightly acute lobed; basal sinus usually quite broad, 
at insertion of petiole, in the more cordate forms, sinus inverted U shaped with 
limbs partly closing around it; margin curving toward back of leaf, causing upper 
surface to be somewhat convex; rarely lobed, teeth broad, usually shallow, acute 
to rarely right angled, mostly convex, sometimes straight on margin, with a very 
acute or mucronate point; margins of teeth pubescent; venation from the generally 
6, rarely 5 or 7, pairs of nearly opposite ribs, with little or no prominence; 
usually pubescent along the ribs and with pubescent tufts in forks of ribs; 
surfaces generally covered wi ay cottony hairs, giving a dull ashy appearance; 
color dark dull green; texture very dense in its native, dry regions; thin and 
fragile at Yenison, Texas. Leaves of seedling first year, entire. 


