MOXOCOTYLEDOJS^OUS OR ENDOGENOUS PLANTS. 507 



pedicels ; glumes 2, nearly equal, longer than the palcjK ; 

 2)alecB 2, the lower one commonly awned on the back, 3-5- 

 nerved, the upper 2-nerved, occasionally minute or want- 

 ing ; stamens 1-3 ; styles or stigmas 2 ; grain free. 



§ 1. Trichodium. Upper palea minute or wanting, the lower awnless, shorter than 

 the unequal acute rough-keekd glumes. 



A. SCABRA, Willd. Culms slender, erect; leaves short; 

 hranclies of the panicle long, hair-like, hispid, bearing the 

 purple spikelets near their summits. (T. laxiflorum, Ell.) 

 Sterile soil. June and July. Panicle usually as long as 

 the culm. Annuals. 



§ 2. Agrostis proper. Upper palea manifest, the lower commonly awned on the back. 



A. RUPESTRis, All. Culms slender, erect; jmnicle small, 

 oblong, with erect smooth branches; glumes lanceolate, 

 nearly equal, rough-keeled; lower palea one-third shorter 

 than the glumes, short-awned below the middle, the u])])er 

 one minute. Julv. Culms 1° high. 



POLYPOGON, Desf. Beard Grass. 



Flat-leaved chiefly annual grasses, with the 1-flowered 

 spikelets stalked, and crowded in close clusi;ers into a ter- 

 minal spiked panicle; glumes 2, equal, awned, and much 

 longer than the paleae, of which the lower one is truncated 

 and toothed at the apex, and often short-awned; stamens 

 3; stiginas 2; grain elliptical, free. 



P. MARITIMUS, Willd. Culms simple (6-8' high) ; glumes 

 pubescent, hispid on the keel, one-third as long as the 

 slender awns ; lower palea 4-toothed, unawned. (Phleum 

 pratense, Ell., Herb.) Sea-shore. 



MUHLEXBERGIA, Schreb. Drop-seed Grass. 



Spikelets 1-flowered; ^i7??^?;2e5 persistent, pcintt'd or awned, 

 equal, or the lower one smaller; palecB 2, sessile in the 



