GENUS 99. 



GRASS FAMILY. 



279 



14. Bromus arvensis L. Field Chess or 

 Brome. Fig. 675. 



Bromus arvensis L. Sp. PI. 77. 1753. 



Culms erect, i-3 tall, smooth and shining, 

 glabrous except at or near the brown nodes. 

 Sheaths shorter than the internodes, softly and 

 densely pubescent with short reflexed hairs ; ligule 

 scarious, i"-:*" long; blades erect or ascending, 

 more or less hirsute on both surfaces, 3 '-6' long, 

 2" -3" wide ; panicle ample, s'-g' long, its rough 

 branches erect or ascending, rarely spreading, 

 branching and spikelet-bearing above the middle, 

 the longer 3 '-6' long; spikelets, including the 

 awns, g"-i2" long, lanceolate, somewhat shining, 

 the scales membranous, scarious on the margins, 

 minutely and sparsely appressed-pubescent toward 

 the acute apex, papillose along the nerves, the 

 first scale 3-nerved, the second 5-nerved ; flower- 

 ing scales broadest at the middle, 5-nerved, 3^ "-4" 

 long, bearing an erect awn of about the same 

 length. 



Fields and waste places. New York to Michigan, 

 Missouri and Florida. Locally adventive from Eu- 

 rope. Summer. 



15. Bromus patulus M. & K. Spreading 

 Brome-grass. Fig. 676. 



Bromus patulus M. & K. in Roehl. Deutsch. Fl. i : 684. 

 1823. 



Culms i-iA tall. Sheaths softly pubescent ; blades 

 up to 6' long and about 2" broad, pubescent ; panicle 

 S'-8' long, diffuse, somewhat drooping; spikelets 

 drooping, on slender pedicels, lanceolate, io"-i2" 

 long, about 2.\" broad, glabrous, the first scale 

 3-nerved, the second one 5-nerved, the flowering 

 scales p-nerved, $."-$." long, emarginate at the apex, 

 the awn 4" -5" long, usually twisted and divaricate 

 at maturity, inserted below the apex of the scale. 



Sparingly introduced into Massachusetts, South Da- 

 kota and Colorado. July and Aug. 



Corn Brome. 



16. Bromus squarrosus L. 



Fig. 677. 



Bromus squarrosus L. Sp. PI. 76. 1753. 



Culms S'-iS' tall, erect, simple, smooth and 

 glabrous. Sheaths shorter than the internodes, 

 softly pubescent; ligule \" long; blades i'-5' 

 long, i "-2" wide, softly pubescent; panicle 2' -6' 

 in length, open, the branches ascending or droop- 

 ing, often flexuous ; spikelets nodding, 6-i2-flow- 

 ered, on slender pedicels ; empty scales obtuse or 

 acutish, the first 5-nerved, the second longer, 7-9- 

 nerved; flowering scales- 4.4 "-5 i" long, obtuse, 

 shining, minutely scabrous ; awn inserted below 

 the apex, about as long as the scale, bent at the 

 base and divergent. 



In ballast and waste places about the eastern sea- 

 ports. Fugitive or adventive from Europe. July- 

 Aug. 



