Bromus Festuceae 95 



cally inundated. I have seen it on rocky wooded slopes, however, and on 

 the top of the bluff of the Ohio River, where it was 200 feet above the 

 water. In my opinion fire and grazing have been instrumental in limiting 

 its distribution on the uplands. 



Se. U. S. from Va. to Mo. and Okla., southw. to Fla. and Tex. 



2. FESTUCEAE Nees. Fescue Tribe 



Plants stout, usually 1.5-2.5 m high; inflorescence large, plumelike; rachilla plumose. 



26. Phragmites, p. 111. 



Plants much shorter, rarely as high as 1.5 m; inflorescence not plumelike; rachilla not 

 plumose. 

 Lemmas prominently 3-nerved, without a cobwebby base. 

 Lemmas more or less villous on the nerves. 



Nodes of stem glabrous; plants mostly 75-125 cm high, basal parts smooth to 



the touch 31. Triodia, p. 113. 



Nodes of stem pubescent; plants mostly 25-60 cm high, basal parts rough to 



the touch 32. Triplasis, p. 113. 



Lemmas not villous on the nerves, glabrous or scabrous. 

 Lemmas less than 5 mm long; fruit less than 5 mm long. .12. Eragrostis, p. 108. 



Lemmas about 8 mm long; fruit about 5 mm long 15. Diarrhena, p. 110. 



Lemmas 5-many-nerved (the intermediate pair in some species of Poa obscure). 

 Spikelets with 2 or 3 empty lemmas above the 2 or 3 fertile florets, or with 1-4 

 sterile lemmas below the 6 or 7 fertile florets. 



Sterile lemmas above the fertile florets 28. Melica, p. 111. 



Sterile lemmas below the fertile florets 20. Uniola, p. 110. 



Spikelets without sterile lemmas (terminal florets often not developed). 

 Lemmas awned. 



Lemmas awned or awn-tipped from a minutely bifid apex. 



Grain pubescent at the summit ; callus of florets not bearded 



2. Bromus, p. 95. 



Grain not pubescent at the summit; callus of florets bearded 



29. Schizachne, p. 112. 



Lemmas awned from the tip, rounded on the back; grain not pubescent at 



the summit 3. Festuca, p. 99. 



Lemmas awnless. 



Spikelets strongly flattened, subsessile in 1-sided clusters at the ends of long 



naked branches, these spreading in anthesis, erect in fruit 



21. Dactylis, p. 111. 



Spikelets neither strongly flattened nor in clusters. 



Florets cobwebby at the base 10. Poa, p. 104. 



Florets not cobwebby at the base. 



Lemmas plainly 7-nerved, scarious at the apex 6. Glyceria, p. 102. 



Lemmas 5-nerved, sometimes 2 of the nerves obscure. 



Lemmas 8-11 mm long 2. Bromus, p. 95. 



Lemmas mostly less than 8 mm long. 



Lemmas keeled on the back 10. Poa, p. 104. 



Lemmas rounded on the. back 3. Festuca, p. 99. 



2-389. BROMUS L. Bromegrass 



[Shear. A revision of the North American species of Bromus occurring 

 north of Mexico. U. S. Dept. Agric. Agrost. Bull. 23 : 1-66. 1920. Wiegand. 

 Notes on some East- American species of Bromus. Rhodora 24: 89-92. 

 1922.] 



[Note: Measurements of spikelets, glumes, and lemmas do not include awns.] 



