220 GRAMINEAE. 



2. Bromus erectus Huds. Upright Brome-grass. (Fig. 507.) 



Bromus erectus Huds. Fl. Angl. 39. 1762. 



Culms 2-3 tall, erect, simple, slender, smooth and 

 glabrous. Sheaths shorter than the internodes, smooth 

 and glabrous, or slightly pubescent; ligule }&" long, 

 erose-truncate; leaves sparingly pubescent, i"-2" 

 wide, those of the culm 4 / -8 / long, the basal about 

 i long, very narrow; panicle i>'-l f in length, the 

 branches erect or ascending, the lower i'-3' long; 

 spikelets J^'-i^' long, sometimes purplish, 5-10- 

 flowered; empty scales acuminate, the first I -nerved, 

 the second longer, 3-nerved; flowering scales 5 7/ -6 /r 

 long, acuminate, very rough-pubescent, 5-nerved, the 

 intermediate nerves faint; awn i"--^' long. 



In waste places about New York. Adventive from 

 Europe. July-Aug. 



3. Bromus asper Murr. Hairy Brome- 

 grass. (Fig. 508.) 



Bromus asper Murr. Prodr. Stirp. Goett. 42. 1770. 



Culms 2-6 tall, erect, simple, rough. Sheaths 

 shorter than the internodes, strongly retrorse-hirsute, 

 especially the lower; ligule i% /f long; leaves 8 / -i 

 long or more, $"-(>" wide, rough or often hirsute; 

 panicle 6'-i2 x in length, open, the branches usually 

 drooping; spikelets 5-io-flowered \ f -\y z f long; empty 

 scales acute, scabrous on the nerves, the first i-nerved, 

 the second longer, 3-nerved; flowering scales about 6" 

 long, acute, hispid near the margins and on the lower 

 part of the keel; awn 3 // ~4 // long. 



In waste places, New Brunswick to Michigan and Ken- 

 tucky. Naturalized from Europe. July-Aug. 



4. Bromus tectorum L,.^ Downy Brome-grass. (Fig. 509.) 



Bromus tectorum L. Sp. PI. 77. 1753. 



Culms 6'-2 tall, erect from an annual root, simple, 

 smooth and glabrous. Sheaths usually longer than 

 the internodes, at least the lower ones softly pubes- 

 cent; ligule i // -2 // long; leaves i'-4' long, i // -2 // 

 wide, softly pubescent; panicle 2 / -6 / in length, open, 

 the branches slender and drooping, somewhat one- 

 sided; spikelets numerous, 5-8-flowered, on capillary 

 recurved slender pedicels; empty scales acuminate, 

 usually rough or hirsute, the first i -nerved, the sec- 

 ond longer, 3-nerved; flowering scales 4 // -6 // long, 

 acuminate, 7-nerved, usually rough or hirsute; awn 

 6"-8" long, 



In fields and waste places, Rhode Island to Ontario, 

 south to Maryland and Ohio. Naturalized from Europe. 

 Sometimes a troublesome weed. May-July. 



