FRANGULACEAE. 



Umbels mostly terminal ; leaves dull beneath, glabrate or villous. 



2. C. pnbescens. 

 Umbels mostly axillary ; leaves silky beneath. 



Leaf-blades distinctly glandular-serrate ; plant not spiny. 3. C. subsericeus. 

 Leaf-blades obsoletely denticulate or entire ; branches often ending in spines. 



4. C. Fendleri. 



1. Ceanothus velutinus Dougl. On hillsides from Mont, and B. C. to Colo, 

 and Calif. Alt. 6000-7000 ft. Headwaters of Clear Creek; near Empire; 

 Steamboat Springs; Walton Creek; Four-Mile Hill, Routt Co.; Sheephorn 

 Divide ; between Pallas and Sydney ; Poudre Canon ; mountains between 

 Sunshine and Ward; Pinkham Creek; Beaver Creek. 



2. Ceanothus pubescens (T. & G.) Rydb. (C. ovatus pubescens T. & G.) 

 In sandy soil from Mich, and S. D. to Mo. and Colo. Alt. 4000-8000 ft. 

 Foot-hills, Larimer Co. ; Colorado Springs ; Pennock's mountain ranch ; 

 Horsetooth Mountain; Monument; Boulder. 



3. Ceanothus subsericeus Rydb. Foot-hills of Colo. Alt. about 6000 ft 

 Larimer Co. 



4. Ceanothus Fendleri A. Gray. In woods and on hillsides from S. D. and 

 Wyo. to N. M. and Ariz. Alt. 5000-9000 ft.- Headwaters of Clear Creek ; 

 Denver to Idaho Springs ; Sangre de Cristo Creek ; Mancos ; Pagosa Springs ; 

 Grayback mining camps and Placer Gulch; Boulder; west of Ouray; Mt. 

 Harvard; southeast of Ouray; Rist Canon; vicinity of Arthur's Rock, Lari- 

 mer Co. ; Leroux Creek ; Horsetooth Gulch ; Pennock's mountain ranch ; 

 Horsetooth Mountain ; mountains between Sunshine and Ward. 



Family 85. VITACEAE Lindl. GRAPE FAMILY. 



Hypogynous disk present; leaf-blades simple. i. VITIS. 



Hypogynous disk wanting or obsolete : leaf-blades digitately s-7-foliolate. 



2. PARTHENOCISSUS. 



i. VITIS L. GRAPES. 



i. Vitis vulpina L. (Vitis riparia Michx.) Along streams from N. B. 

 and N. D. to W. Va., Tex. and Colo. Alt. 4000-9000 ft. W T alsenburg; Dixon 

 Canon, Larimer Co.; Ft. Collins; banks of Cache la Poudre; Rist Canon; 

 gulch west of Pennock's ; Boulder. 



2. PARTHENOCISSUS Planch. VIRGINIA CREEPER, AMERICAN IVY. 



Aerial rootlets present; tendrils with disks. i. P. quinquefolia. 



Aerial rootlets lacking; tendrils without disks. 2. P. laciniata. 



1. Parthenocissus quinquefolia (L.) Planch. In woods and on banks from 

 Que. and Man. to Fla. and Tex. Reported from Colorado (Meehan), but 

 doubtful. 



2. Parthenocissus vitacea Hitchc. (P. quinquefolia laciniata Planch. ; P. 

 lacinata Small) On river banks and in woods from Mich, and Wyo. to Ohio 

 and Ariz. Alt. 4000-6000 ft. Foot-hills, Larimer Co.; Cheyenne Canon ; Ft. 

 Collins; North Cheyenne Canon ; Golden; vicinity of Arthur's Rock; near 

 Boulder. 



