317] FLORA OF BOULDER, COLORADO 169 



and Ward (Rydberg). South Boulder Canon, and hill north 

 of Nederland (Ramaley). 



SOUTH DAKOTA to WYOMING; NEW MEXICO to ARIZONA. 



Family 70. VITACEAE Lindl. Grape family. 



279. VITIS L. GRAPE. 



688. V. vulpina L. [V. riparia Michx.]. RIVER-BANK GRAPE. 

 Common along the banks of streams in the plains, mesas, 



and lower foothills, 5100-6000 ft. (Daniels, no). Certain 

 forms with strongly lobed leaves simulate V. palmata Vahl., 

 and may be a distinct species. 



NEW BRUNSWICK to NORTH DAKOTA; WEST VIRGINIA to 

 TEXAS and COLORADO. 



689. V. Boulderensis Daniels. Nov. sp. BOULDER GRAPE. 

 Plant weakly climbing, tendrils few, but these stout and 



little curled, bark reddish brown, the young twigs densely 

 floccose pubescent, leaves small, at most 6 cm. long and wide, 

 exclusive of the petiole, ovate to orbicular, the sinus often 

 deep or sometimes shallow, broad and nearly obsolete; leaves 

 mostly truncate at the top, the apices of the two shallow lat- 

 eral lobes but little shorter than the main apex, the leaves, 

 however, occasionally sharply acuminate, the margins coarsely 

 dentate, slightly lobed, on slender petioles, which are loosely 

 floccose as well as the veins both above and beneath, but be- 

 coming glabrate in age; clusters small, mostly in simple ra- 

 cemes, or with one or two prominent branches, fruit not set on 

 the only vine discovered, and all flowers examined staminate. 



Nearest Vitis Arizonica Engelm. 



Gulch at base of Flagstaff Hill, 5800-6000 ft. (Daniels, 

 119). 



280. PESEDERA Neck. VIRGINIA CREEPER. 



690. P. vitacea (Hitchc.) Greene [Ampelopsis quinque folia 

 vitacea (Hitchc.) Knerr; Parthenocissus vitacea 

 ( Hitchc. ) ] . VINELIKE VIRGINIA CREEPER. 



Common about streams and along fences, in the latter case 

 perhaps the plant is P. quinquefolia (L.) Planch, intro- 



