34l] FLORA OF BOULDER, COLORADO I93 



807. F. angustifolia Rydb. Narrow-leaved columbo. 

 Mountains between Sunshine and Ward (Rydberg). 

 Montana to Colorado. 



Order 37. ASCLEPIADALES. 



Family 89. APOCYNACEAE Lindl. Dogbane Family. 



346. APOCYNTJM L. Dogbane. 



808. A. androsaemifolium L. Spreading dogbane. 



South Boulder Canon, and north of Nederland, 6500-9000 

 ft. (Ramaley). 

 Anticosti to British Columbia; Georgia to Arizona. 



809. A. scopulomm Greene. Crag dogbane. 



Common on the foothills, 6000-9000 ft. (Daniels, 231). Su- 

 garloaf (Ramaley). 



Saskatchewan and Yukon to Colorado. 



810. A. lividum Greene. Pale dogbane. 

 Eldora (Ramaley). 



Colorado. 



811. A. ambigens Greene. Smooth dogbane. 



In Boulder Canon, Bear Canon, and other valleys in the 

 foothills, 5600-8000 ft. (Daniels, 515). 

 Montana to Washington ; Colorado to California. 



812. A. cannabiaum L. Indian hemp. 



Along railroads and stream banks, and ascending along the 

 canons and gulches for some distance into the foothills, 5100- 

 6500 ft. (Daniels, 348). 



Anticosti to Washington ; Florida to Lower Califor- 

 nia. 



813. A. hypericifolium Ait. Clasping-leaved dogbane.. St. 

 Johnswort Indian hemp. 



Along the railroad between Boulder and Marshall, and along 

 roads in the plains, 5100-6000 ft. (Daniels, 409). 

 Ontario to British Columbia ; Ohio to New Mexico. 



