GUNNERACEAE. 249 



i. HIPPURUS L. MARE'S-TAIL, BOTTLE-BRUSH. 



i. Hippurus vulgaris L. In water from Greenl. and Alaska to Mich., N. M. 

 and Calif. Alt. 7000-10,000 ft. Ironton Park, 9 miles south of Ouray; 

 Gunnison; Laramie River near Colorado line; Wahatoya Creek; Hamor's 

 Lake above. Durango ; Hotchkiss. 



2. MYRIOPHYLLUM L. WATER-MILFOIL. 



i. Myriophyllum spicatum L. In water from Newf., Sask. and Ida. to 

 Fla. and Calif. Alt. up to 8000 ft. Gunnison. 



Order 38. UMBELLALES. 



Fruit drupaceous or baccate ; gynoecium i-several-carpellary ; if 2-carpellary, 



stigmas introrse. 



Ovule with a ventral raphe ; leaves mostly alternate ; blades lobed or compound. 



98. HEDERACEAE. 

 Ovule with a dorsal raphe ; leaves mostly opposite ; blades entire or merely 



toothed. 99- CORNACEAE. 



Fruit dry, a cremocarp ; gynoecium 2-carpellary ; stigmas terminal. 



100. AMMIACEAE. 



Family 98. HEDERACEAE L. IVY FAMILY. 

 i. ARALIA L. WILD SARSAPARILLA. 



i. Aralia nudicaulis L. In woods from Newf. and Ida. to N. C, Mo. and 

 Colo. Alt. 5000-9000 ft. Mountains of Estes Park, Larimer Co. ; mountains, 

 Larimer Co. ; north of Cheyenne Canon ; Engelmann's Canon ; Colorado 

 Springs; Jack Brook; Boulder. 



Family 99. CORNACEAE Link. DOGWOOD FAMILY. 



Flowers in open cymes, not subtended by an involucre; shrubs. i. SVIDA. 

 Flowers in a head or umbel subtended by a large white involucre ; herbs. 



2. CORNELLA. 



i. SVIDA Opis. DOG- WOOD, CORNEL. 



Young branches and inflorescence villous. i. 5". interior. 



Young branches appressed strigose or nearly glabrous. 2. S. stolonifera riparia. 



1. Svida interior Rydb. On river banks in Neb., S. D., Wyo. and Colo. 

 Alt. 4000-6000 ft. Colorado Springs; Canon City; Meeker; Walsenburg; 

 gulch west of Pennock's. 



2. Svida stolonifera riparia Rydb. On river banks from Man., Mackenzie 

 and Alaska to Neb., Colo, and Ariz. Alt. 4000-10,000 ft. Lake City; Ouray; 

 6 miles below Hot Sulphur Springs; Walsenburg; Minnehaha; Upper La 

 Plata Canon; Box Canon, west of Ouray; Pass Creek; Ft. Collins; Crystal 

 Creek; Redstone; Gunnison; Mancos; Turkey Creek and tributaries; Par- 

 lin, Gunnison Co.; gulch south of Rist Canon; Bosworth's ranch; near 

 Narrows of Cache la Poudre ; gulch west of Pennock's ; Stove Prairie. 



2. CORNELLA Rydb. BUNCH-BERRY, DWARF CORNEL. 



i. Cornelia canadensis (L.) Rydb. (Cornus canadensis L.) In woods 

 from Lab. and Alaska to N. J., Minn., Colo, and Calif. North Park. 



