Genus 99. 



GRASS FAMILY. 



s 79 



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"-ii" long; blades erect or ascending, 

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

 2" -3" wide; panicle ample, s'-o/ 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, 9"-ia" 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, 34"-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. 1 : 684. 

 1823. 



Culms i°-ii° 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 9-nerved, 3i"-4i" 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. 



16. Bromus squarrosus L. Corn Brome. 

 Fig. 677. 



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



Culms 8'-i8' tall, erect, simple, smooth and 

 glabrous. Sheaths shorter than the internodes, 

 softly pubescent; ligule I" 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, 6-12-flow- 

 ered, on slender pedicels; empty scales obtuse or 

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

 nerved; flowering scales 4i"-5l" 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. 



