280 



GRAMINEAE. 



VOL. I. 



17. Bromus brizaeformis Fisch. & Mey. 

 Quakegrass or Awnless Brome. Fig. 678. 



Bromus brizaeformis Fisch. & Mey. Ind. Sem. Hort. 

 Petrop. 3: 30. 1836. 



Culms 8'-2 tall, erect, simple, often slender, 

 smooth and glabrous. Sheaths shorter than the 

 internodes, the lower pubescent with soft villous 

 hairs; ligule i" long, erose-truncate ; blades i'-7' 

 long, i "-3" wide, pubescent; panicle ii'-8' in length, 

 open, the branches ascending or often drooping, 

 flexuous; spikelets few, i'-i' long, laterally much 

 compressed; empty scales very obtuse, often pur- 

 plish, glabrous or minutely pubescent, the first 3-5- 

 nerved, the second larger, 5-o,-nerved ; flowering 

 scales 3"-4" long, very broad, obtuse, g-nerved, shin- 

 ing, glabrous or sometimes minutely pubescent, un- 

 awned. 



Sparingly introduced from Massachusetts to Michigan, 

 Delaware and Indiana ; also from Montana to British 

 Columbia, California and Colorado. Native of northern Europe and Asia. Briza-like brome. 

 July-Aug. 



18. Bromus breviaristatus (Hook.) Buckl. 

 Short-awned Chess, or Brome. Fig. 679. 



Ccratochloa breviaristata Hook. Fl. Bor. Am. 2: 253. 1840. 

 B. breviaristatus Buckl. Proc. Acad. Phila. 1862: 98. 1862. 



Culms i-4 tall, erect, simple, smooth or rough, 

 sometimes pubescent below the panicle. Sheaths pubes- 

 cent, at least the lower ones, which are often overlap- 

 ping; ligule i" long, truncate ; blades 6'-i longer more, 

 2" -6" wide, rough and often pubescent; panicle 4'-iS' 

 in length, its branches erect or ascending, the lower 

 2'-6' long; spikelets 5-io-flowered ; empty scales acute, 

 pubescent, the first 3~5-nerved, the second longer, 5-9- 

 nerved ; flowering scales compressed, keeled, 6" -7" long, 

 acute, 7-g-nerved, appressed-pubescent; awn 2" -3" long. 



In dry soil, Manitoba to British Columbia, south to Iowa, 

 Arizona and California, and as an occasional escape from 

 cultivation eastward. July-Aug. 



rf ^? 



19. Bromus unioloides (Willd.) H.B.K. 



Johnson Grass. Schrader's Brome- 



grass. Southern Chess. Fig. 680. 



Festuca unioloides Willd. Hort. Berol. i : 3. pi. 3. 



1806. 



B. unioloides H.B.K. Nov. Gen. i: 151. 1815. 

 Bromus Schraderi Kunth, Enum. i : 416. 1833. 



Culms 6'-3 tall, erect, simple, smooth and gla- 

 brous. Sheaths usually shorter than the inter- 

 nodes, the lower often overlapping, smooth or 

 rough, and glabrous or frequently pubescent; 

 ligule i "-2" long; blades 3'-i3* long, i"-4" wide, 

 usually rough, at least above; panicle 2'-io' in 

 length, the branches erect or ascending, or the 

 lower branches of the larger panicles widely 

 spreading; spikelets much compressed, 6-io-flow- 

 ered ; empty scales acute, the first 3-5-nerved, the 

 second longer, 5-o-nerved ; flowering scales 6"-8" 

 long, very acute, minutely scabrous, bearing an 

 awn less than i" long or awnless. 



Missouri to the Indian Territory, Texas, Georgia. 

 Florida and Mexico. Widelv distributed in tronical 

 America. Rescue- or Wild Brome-grass. May-July. 



