26 GRAMINEAE 



spikelets i'' long. — Saudy fields in the Missouri Bottom near Courtney. 

 Local. August-September. 



22. CINNA L. 



Glumes three, the third bearing a short awn. Palet l-nerved. 



1. C. arundinacea L. Wood Reed-grass. Perennial 2°-4° tall : 

 leaves flat, 6' long : panicle about 6^ long, its branches densely flowered, 

 spreading: spikelets 2^'^ long. — Common in moist woods and meadows. 

 July-September. 



23. AGROSTIS L. 



Outer glumes about equal or the lowest the longer. Flowering glumes 

 and palet hyaline, the latter often very sniall or w.mting. Seed adher- 

 ent to pericarp. 



Culms erect. 



Branches of panicle branching below the middle. 1. A. alhn. 



Branches of panicle branching above the middle. 2. A. hyemalis. 



Culms weak and decumbent. 3. A. jiereniums 



1. A. alba L. Red-top Grass. Culms errect or ascending, some- 

 times decumbent at base, l°-3" high, smooth : panicle 4^-10' long, con 

 tracted or open, and with ascending or spreading branches : spikelets 

 slightly more than V^ long : palet one-third the length of the third 

 glume. — Common in wet meadows and fields. May-July. 



2. A. hyemalis (Walt. ) B.S. P. Haik-gkass. Culms densely tufted, 

 l°-2° high, slender : leaves l'-2' long : panicle branches capillary and 

 scabrous, at first erect, at length widely spreading and much branched : 

 spikelets V^ long or less : palet very small. — Common. Maj'-June. 



3. A.perennans (Walt.) Tuckerm. Thin-grass. Culms 6^-2° long : 

 leaves ',V-\' long : panicle 2^-8' long, pale green, diffusely spreading, its 

 branches divided below the middle : spikelets V^ long or less : palet small 

 or wanting. — A delicjite grass growing in moist woods throughout. Not 

 uncommon. August-September. 



24. CALAMAGROSTIS Adans. Reed-grass. 

 Perennials. Rachilla produced beyond the palet and hairy. Glumes 

 three, the two outer empty, keeled, membranous and about equal, the 

 third shorter and copiously hairy at base, sln>rt-awned. 



Panicle open with spreading branches. 1. C. Macouniana. 



Panicle narrow and strict, branches erect. 2. C. iuexpmiM. 



1. C. Macouniana Vasey. 2°-4° high : panicle F>'-(V long, lA'-2' 

 wide, the longer branches 2^ long, slender, straw-colored : spikelets U" 

 long, the outer glumes acute, the second slightly longer than the first : 

 hairs copious, the length of the third scale, which bears a delicate straight 

 awn. — Wet meadows in the Little Blue Valley from Buckner and Lake 

 City to Atherton. Locally rather common. May -July. 



