GRAMINE^ 183 



Spica-Venti, Beauv); flowering glume with a long awn, 

 panicle large (3 in.), spreading; cultivated land. A. in- 

 terrupta, L., similar, but panicle narrow, interrupted / 

 cultivated land. 



14. Calamagrostis, Adans. 



Rachis of spikelet with long silky hairs; spikelets in 

 a close panicle with whorled branches, i -flowered ; stem 

 tall, leafy. 



A. Flowering glumes hyaline: — C. Epigejos, Roth; 

 panicle open, awn of flowering glume inserted above the 

 middle; wet places. C. lanceolata, Roth; panicle open, 

 awn terminal ; swamps. C. tenella, Host. ; stem 1 8-24 

 in., slender, hairs of rachis few ; dry ; alpine. C. Hal- 

 leriana, DC. ; stem 2-3^ ft., rachis very hairy ; alpine 

 meadows. C. litorea, DC. ; panicle rather drooping, stem 

 usually very rough ; river-banks, local. 



B. Flowering glumes not hyaline, or only at the edge, 

 awn of flowering glume twisted (Deyeuxia, Clar.) : — C. 

 varia, Lk. (montana, DC.) ; awn bent, hairs of rachis very 

 long; bushy; alpine. C. arundinacea, Roth (sylvatica, 

 DC.) ; hairs of rachis not so long, awn bent ; bushy ; 

 alpine. C. neglficta, Fr. ; awn straight ; peat-bogs, very 

 rare; Pontarlier, Constance. 



15. Lasiagrostis, Lk. 



Resembling Calamagrostis, but only the empty glumes 

 enveloped in long silky hairs. 



L. Calamagrostis, Lk. ; panicle spreading, white, shin- 

 ing, awn of empty glume very long ; rocky ; alpine. 



