GRASSES OF IOWA. 



177 



2. CALAMAGROSTIS CANADENSIS. 



Calamagrostis Canadensis Beauv. Agros. 15. 1812. Watson and Coulter 

 Gray. Man. Bot. 650. pl.8. 1890. (6th eel.) Scribner. Grasses of Tenn. Bull. 

 Univ. Tenn. Agrl. Exp. Sta. 7: 79./ io./. 1894. 



Calamagrostis Canadensis (Michx.) Beauv. Beal. Grasses of N. A. 2: 

 351. 1896. Nash in Britton and Brown. 111. Fl. 1: 163. /. 373. 1896. 

 Kearney. Bull. U. S. Dept. Agrl. Div. Agros. 11. 28. 



Calamagrostis Mexicana Nutt. Gen. 1:46. 1818. 



A rundo agrostoides Pursh. Fl. Am. 86: 1814. 



Arundo Canadensis Michx. Fl. Bor. Am. 1: 73. 1803. 



Deyeuxia Canadensis Munro . Hook. Trans. Linn. Soc. 23: 345. 1862. 



Dl-SCRIPTION. 



Blue Joint or Red Tor. 

 An erect, leafy grass, 3 to 5 

 feet (7-12 dm.) high, with 

 smooth, simple culms and open, 

 brown or purplish, many- 

 flowered panicles, 4 to 8 

 inches (9-18 cm.) long. 

 Sheaths smooth, striate; li- 

 gule 2 to 3 lines (4-6 mm.) 

 long, membranous ; leaf-blade 

 flat, 6 to 18 inches (12-36 

 cm.) long, 2 to 4 lines (4-8 

 mm.) wide, tapering grad- 

 ually into long, filiform tips. 

 Empty glumes ovate-lanceo- 

 late, acute, finely strigose, 

 scabrous, awned on the back 

 at or a little below the 

 middle; awn straight, very 

 slender; hairs from the callus 

 as long as the glume. In 

 sw T amps and w r et soils. July 

 to September. A valuable 

 grass in low meadows. Once 

 Pin io* t'r.i„™ ,■ n ^ much more abundant than 



Fig. \io. Calamagrostis Canadensis— a,, 

 spikelet with lower, outer glumes to the right of now. Widely distributed in 

 floret. (Charlotte M. King. ) T 



Jowa. 



12 



