2SO 



GRAMINEAE. 



Vol. I. 



Columbia, California and Colorado. 

 July-Aug. 



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 1" long, erose-truncate ; blades I'-f 

 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, 5-9-nerved; flowering 

 scales 3"-4" long, very broad, obtuse, 9-nerved, shin- 

 ing, glabrous or sometimes minutely pubescent, un- 

 awned. 



Sparingly introduced from Massachusetts to Michigan, 



Delaware and Indiana ; also from Montana to British 



Native of northern Europe and Asia. Briza-like brome. 



18. Bromus breviaristatus (Hook.) Buckl. 

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



Ceratochloa 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 1" long, truncate ; blades 6'-i° long or more, 

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

 in length, its branches erect or ascending, the lower 

 2'-6' long; spikelets S-10-flowered; empty scales acute, 

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

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

 acute, 7-9-nervecr; appressed-pubescent ; awn a"-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. 



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



Johnson Grass. Schrader's Brome- 



grass. Southern Chess. Fig. 680. 



Festuca unioloides Willd. Hort. Berol. 1 : 3. pi. 3. 



1806. 



B. unioloides H.B.K. Nov. Gen. 1: 151. 181s. 



Bromus Schraderi Kunth, Enum. 1 : 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 3-13' long, l"-4" wide, 

 usually rough, at least above; panicle 2-10' in 

 length, the branches erect or ascending, or the 

 lower branches of the larger panicles widely 

 spreading; spikelets much compressed, 6-10-flow- 

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

 second longer, 5-9-nerved ; flowering scales 6"-8" 

 long, very acute, minutely scabrous, bearing an 

 awn less than 1" long or awnless. 



Missouri to the Indian Territory, Texas, Georgia. 

 Florida and Mexico. Widely distributed in tronical 

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



