172 



American Midland Naturalist Monograph No. 4 



Field Guide to the Species 



Leaves 2 to 4 inches across, rather thinnish ; berries covered v^ith a whitish bloom ; 



occurs in California parks I. V. calif orrtica. 



Leaves mostly I|/2 to 3 inches across, thickish ; berries with scarcely any bloom; 



occurs in parks of the Southwest 2. V . arizonica. 



L California Grape (Vitis calif ornica Benth.). — Woody vine with 

 stems 10 to 50 feet or more long; young leaves and twigs usually densely white- 

 hairy or cottony; leaves roundish, shallowly 3-lobed usually above the middle, 

 heart-shaped at the base, mostly 2 to 4 inches in diameter, the margins toothed; 

 flowers small, the whitish petals soon falling, borne in many-flowered clusters 

 along the stems opposite the leaves; fruits globose, about 1/3 inch in diameter, 

 dark purple-black with a whitish bloom, the bunches drooping. 



Occurrence. — YOSEMITE, rare, 2,500 to 4,000 feet: Hetch Hetchy Valley; Yosemite 

 Valley at John Muir's fern ledge. SEQUOIA: near Ash Mountain, 1,600 feet; North 

 Fork Kaweah River. 



2. Canyon Grape (Vitis arizonica Engelm.), fig. 99. — Hardly to be 

 distinguished from California wild grape, but the leaves a little smaller; tendrils 

 smaller; berries a little smaller and without a bloom. 



Fig. 99. Canyon grape (^Vitis arizonica). 



Occurrence. — ZION, about 4,500 feet: Zion Canyon north of public camp grounds; 

 Weeping Rock trail; the Narrows trail. GRAND CANYON, in the canyon, 2,500 to 4,700 

 feet: Indian Gardens and along Garden Creek; Bright Angel Creek above Phantom 

 Ranch; Roaring Springs; Nankoweap Basin; Cataract Canyon. 



Thicket Creeper (Parthenocissus inserta (Kern.) Fritsch.). — Trailing 

 vine with smooth bark, clinging by means of long tendrils, these with 3 to 5 

 branches; leaflets 5 to 7, oval to oblong, 1^/2 to 4 inches long, pointed at the 

 tips, irregularly toothed; flowers borne in flat-topped clusters about 2 inches 

 across; berries globose, small, about 1/5 to I/4 inch in diameter, bluish-black. 

 (Syn. P. vitacea (Knerr) Hitchc.) 



