46 GRAMINACEAE (GRASS FAMILY) 



C. Awn as long as the lemma or longer. (See E.) 

 CC. Awn shorter than the lemma or none. 

 D. Leaves narrow, involute; plants usually tufted. 

 E. Leaf blades quite smooth; young shoots arising outside the leaf sheath. 



F. rubra (RED FESCUE) 

 EE. Leaf blades scabrous at margin or in their upper portion; young shoots 



arising within the leaf sheath. 



F. Panicle rays not cushioned at base; spikelets 5-7.5 mm. long; lemma 3-3.5 



mm. long. F. ovina (SHEEP FESCUE) 



FF. Panicle rays cushioned at base; spikelets 8-12 mm. long; lemma 6-7 mm. 



long. F. viridula 



DD. Leaves flat, wide; plants not densely tufted. F. elatior (TALL FESCUE) 



BROMUS (BROME) 



Leaves flat or nearly so. Spikelets many, 5~i5-flowered; glumes un- 

 equal, acute, the lower i-3-veined, the upper 3-9-veined. Lemma 5-9- 

 veined, awnless or awned from just below the tip. Palet keels ciliate. 

 Stamens 3. Stigmas arising below the hairy cushionlike top of the ovary. 

 Grain adherent. (Gk. broma = food ; Bromus was first the name of a wild 

 oat.) A large genus of forage grasses of which only 10 of the most im- 

 portant are given, and the key separates only those. (F. & R. pp. 65-67.) 



A. Lemma awn 0-16 mm. long. 

 B. Lemma glabrous or merely scabrous. 

 C. Spikelets strongly flattened. 



D. Lemma 6-8 mm. long; glumes scabrous toward the apex. W. E. Becomes 

 a weed in wheat. B. secalinus (CHESS) 



DD. Lemma 14-16 mm. long; glumes smooth. (See HH.) 

 CC. Spikelets terete or nearly so. 



E. Leaf sheath glabrous. W. E. B. inermis (HUNGARIAN BROME) 

 EE. Leaf sheath pubescent. 



F. Panicle dense, erect. (See I.) 



FF. Panicle loose, spreading. W. E. B. racemosus (UPRIGHT CHESS) 



BB. Lemma hairy. 

 G. Spikelets much flattened. 



H. Lemma awn 0-7 mm. long. W. E. B. marginatus 



HH. Lemma awn more than 7 mm. long. W. E. B. carinatus 



GG. Spikelets terete or nearly so. 

 I. Lemma awn 6-8 mm. long; lower glume 3-veined. W. E. 



B. hordeaceus (SOFT BROME) 



n. Lemma awn 10-16 mm. long; lower glume i-veined. 

 J. Annual; leaves and sheaths pubescent; lemma s-veined. E. 



B. tectorum (DOWNY BROME) 



JJ. Perennial; kaves and sheaths glabrous or pilose; lemma 7-veined. W. C. E. 



B. eximus 



AA. Lemma awn 17-25 mm. long. W. E. B. sterilis 



AAA. Lemma awn 35-65 mm. long. W. E. B. maximus 



CHLORIDEAE (Bermuda-grass Tribe). Spikelets i- to several- 

 flowered, in spikes or racemes; spikes i-sided, digitately or racemosely 

 arranged, rarely solitary. Lemma usually keeled, either entire and unawned 

 or else toothed and with 1-3 straight awns. Grain unfurrowed, free. 



