GRASSES OF OHIO 305 



2. Muhlenbergia mexicana (L.) Trin. Mexican Muhlenbergia. 

 A glabrous grass with erect or often prostrate, much-branched 

 stems, 2-4 ft. high, with numerous conspicuous rhizomes, covered 

 with short appressed scales, and with a long contracted panicle, 

 usually partly included within the upper sheath, its branches spike- 

 like and erect or appressed. Lemma acuminate, scabrous, sometimes 

 awned. 



In swamps and borders of fields. Aug., Sept. General. 



3. Muhlenbergia racemdsa (Mx.) B. S. P. Marsh Muhlen- 

 bergia. A grass with erect, usually branched stems, 1-3 ft. high, 

 with numerous conspicuous rhizomes covered with short, appressed 

 scales, and with dense spike-like panicles, interrupted at the base, 

 the branches erect or appressed. Empty glumes aristate ; lemma 

 acuminate, awnless, its midrib strongly scabrous. 



In wet places. Aug.-Oct. Summit, Wayne, Huron. Wyandot, 

 Champaign, Licking. 



4. Muhlenbergia umbrosa Scrib. Wood Muhlenbergia. A grass 

 with erect branched stems, 1-3 ft. high, with numerous conspicuous 

 rhizomes, covered with short appressed scales, and with somewhat 

 lax panicles, the branches erect or ascending. Lemma strongly scab- 

 rous, attenuate into a slender awn. 



In moist woods and along streams. Aug.-Oct. Cuyahoga, 

 Champaign. 



5. Muhlenbergia tenuiflora (Willd.) B. S. P. Slender Muhlen- 

 bergia. A grass with slender, simple or sparingly branched stems, 

 2-3 ft. high, with numerous conspicuous rhizomes covered with short, 

 appressed scales, and with a loosely flowered, slender panicle with 

 appressed branches. Lemma scabrous, tapering into a slender awn. 



In rocky woods and ravines. Aug., Sept. Portage, Wayne, 

 Fairfield. Madison, Greene. 



6. Muhlenbergia schreberi Gmel. Spreading Muhlenbergia. A 

 diffusely much-branched grass with erect or ascending stems. 1-3 

 ft. high, from a decumbent base, often rooting at the lower nodes, 

 and with slender, somewhat lax panicles, the erect branches rather 

 densely flowered. Empty glumes minute, the outer one nearly ob- 

 solete; lemma strongly scabrous, tapering into a slender awn. 



In dry woods, hillsides, and waste places. Aug.. Sept. General. 



45. Brachyelytrum Beauv. Brachyelytrum. 



A tall perennial with flat leaves, simple stems from short knotty 

 rhizomes, and a narrow, few-flowered panicle. Spikelets 1 -flowered, 

 narrow, the rachilla prolonged into a slender naked bristle ; empty 

 glumes minute, unequal ; lemma rigid, 5-nerved, ending in a long 



