GRAMINE^. (GRASS FAMILY.) 413 



floweriug glume exsertly awued ou the back at or below the middle. — 

 Found everywhere, aud very variable, the mouutaiu forms especially beariug 

 many names. Known as "Brown Beut Grass." 



20. CINNA, L. Wood Reed Grass. 



A perennial grass, with .simple aud upright somewiiat reed-like stems, 2 to 

 7 feet high, bearing an ample compound terminal panicle, its branches in 

 fours or fives ; the broadly linear-lanceolate flat leaves with conspicuous 

 ligules. 



1. C. arundinacea, L., var. pendula, Gray. Stem smooth, with 

 conspicuous brownish nodes : leaves rough ou both sides and margins : pani- 

 cle 8 to 12 inches louu:, drooping at apex, the capillary rays clustered, distant, 

 flexuose, very unequal, the longer flower-bearing above the middle, very sca- 

 brous. — California and northward, thence eastward through Montana to the 

 northern border States. 



21. AMMOPHILA, Host. 



Perennials, with stout stems from thick running rootstocks. This is repre- 

 sented in Gray's Manual by the Calamovilfa and Ammophila sections of 

 Calamagrostis. 



1. A. longifolia, Beuth. Stems 1 to 4 feet high : leaves rigid, elon- 

 gated, involute above and tapering into a long thread-like point: branches 

 of the pyramidal panicle smooth : the copious hairs more than half the 

 length of the naked floweriug glume and palet. — Calamagrostis lo7u/ifolia, 

 Hook. From Colorado northward, thence eastward to Michigan and Illinois. 



22. DEYEUXIA, Clarion. Reed Bent Grass. 



Perennials with running rootstocks and mostly tall erect and rigid stems. 

 This genus includes all the species of Calamagrostis in the section Dej/euxia. 

 * Particle hose and open. 



1. D. Canadensis, Beauv. Stems tall, erect, smooth, 3 to 5 feet high: 

 leaves about a foot long, flat, minutely scabrous : panicle 4 to 6 inches long, 

 oblong, the common axis and rays scabrous: spikelets 1^ to If lines long: 

 outer glumes lanceolate, acute: flowering glume nearly as long, surrounded by 

 copious white hairs, and awned on the back from near the middle with a ven/ 

 delicate bristle not much stouter than the hairs, and usually barely equalling 

 or rarely slightly exceeding the palet.— Calamagrostis Canadensis, Beauv. 

 From New Mexicf) northward aud across the continent. 



2. D. LangsdorfiBi, Trin. Clo.<5ely resembling the last, but distin- 

 guished by its longer spikelets (2 to 3 lines), attenuate-acuminate outer glumes, 

 which are often cinereously strigose-pubescent, and its stouter and usually 

 exserted aicn. 



* * Panicle narroio, the erect branches oppressed after flowering. 



3. !D. Xiapponica, Trin. Stem about a foot high : radical leaves nearhf 

 as long; stemleaves much shorter and divergent, oW convolute, rigid and stronglv 



