AGROSTIDEiE. 351 



culm 20-30 cm. long, 5 mm. wide. Panicle erect, interrupted, 

 12-15 cm. long, 2-3 cm. broad; rays numerous in dense clusters, 

 2-3 cm. distant. Spikelets crowded from the apex to near the base 

 of the branches, narrow, smooth, acute, about 4 mm. long; empty 

 glumes subequal, oval-lanceolate, 4 mm. long, first 1-nerved, se(!ond 

 a little the shorter, 3-nerved; hairs thin, about half as long as the 

 floret, the hairy rudiment about 0.3 mm. long; floral glume thin, 

 bifid, as wide as the empty glumes, about 3.5 mm. long, awn 

 straight, inserted a little below the middle and but little longer 

 than its glume; palca hyaline. 



U. S. Dept. Agricul. 1159 from CusicJc, collected on Eagle 

 Creek. Eastern Oregon on mountains at the altitude of 5000 feet. 



Washington and Oregon. 



24. C. Canadensis (Michx.) Beauv. Agrost. 157 (1812). Blue- 

 joint. At undo Canadensis Michx. Fl. Bor. Am. 1:73 (1803). 

 Arundo agrostoides Pursh. Fl. Am. 86 (1814). C. Mexicana Nutt. 

 Gen. 1:46 (1818). 



A perennial with creeping rootstocks. Culms erect, smooth, 

 usually bearing sterile branches near the middle or above, 90-150 

 cm. high. Sheaths close, but little shorter than the internodes; 

 ligule lacerate. 4 mm, long; blades glaucous, flat, scabrid, 15-30 

 cm. long, 6-8 mm. wide, tapering toward the base, apex attenuate. 

 Panicle exserted, loose, open, oblong, mostly tinged with purple, 

 10-20 cm. long; axis and rays mostly scabrous, some branches 

 flower-bearing above the middle only, others for the whole length. 

 Spikelets scabrid, open in flower and in fruit, 2.5-3.5 mm. long; 

 empty glumes ovate-lanceolate, first 1-nerved, second 1-3-nerved; 

 floral glume 2-3 mm. long, ovate, acute, bifid, bearing a very 

 slender straight awn attached near the middle, reaching the tip of 

 its glume or shorter or longer, the hairs from two thirds as long as 

 the floret to a little exceeding it; rudiment minute. 



Vermont, Pringle ; New York, Thurher ; Massachusetts, Beal 

 76; Michigan, CooUy, Clark 701, 3235; Farwell, Beal 77, 78; Illi- 

 nois, Beal ; Minnesota, Baih'ji B 10, B 256, B 529, Sandberg 36, 

 613, 795; Colorado, Cassidij; Wyoming, Buff urn C 86, C 91; Utah, 

 Jones 1274; Washington, Suksdorf 1023, 2127 ; Oregon, Hoioelh 



