21 1] FLORA OF BOULDER, COLORADO 63 



71. A. occidentalis Scribn. [A. alpinus Coulter, not L.]. 

 Western foxtail. 



Above timber-line, Arapahoe Peak, 1 iooo-i 1500 ft. (Dan- 

 iels, 942). 



Alberta to British Columbia; Colorado to Utah. 



45. SPOROBOLUS R. Br. Dropseed. 



72. S. airoides Torr. Hair-grass dropseed. 



Alkaline flats about Boulder lake, scarce, 5300 ft. (Dan- 

 iels, 731). 



Nebraska and Texas to California. 



j 3. S. cryptandrus (Torr.) Gray. Sand dropseed. 



Common on the plains, mesas, and grassy slopes of the 

 foothills, 5100-8000 ft. (Daniels, 513). 



Massachusetts to Washington; Pennsylvania to Arizona 

 and Mexico. 



74. S. heterolepis Gray. Northern dropseed. 



Common along the railroad between Boulder and Mar- 

 shall, 5400 ft. (Daniels, 518). 



Quebec to Saskatchewan; Pennsylvania to Colorado. 



75. S. asperifolius (Nees & Meyen) Thurber. Rough drop- 

 seed. 



Common on the plains, 5 100-5600 ft. (Daniels, 493). 

 Assiniboia to British Columbia; Missouri and Texas to 

 California. 



46. POLYPOGON Desf. Beard-grass. 



76. P. Monspeliensis (L.) Desf. Ditch foxtail. 

 Common along irrigation ditches east of Boulder, 5100- 



5500 ft. (Daniels, 676). 



Europe and Asia, thence to North America. 



47. CINNA L. Wood reed-grass. 



77. C. latifolia (Trev.) Griseb. [C. pendula Trin.]. Slender 

 wood reed-grass. 



Deep canons in shade, frequent; in aspen bogs at Glacier 

 lake and Eldora, 5700-8600 ft. (Daniels, 987). 



