GRASSES OF IOWA. 297 



DISTRIBUTION. 



Iowa. Ames (Hodson, Sirrine). 



North America. In fields and waste places throughout the country, 

 Michigan (Orion M72, O. A. Farwell). 

 General. Europe. 



10. BROMUS HORDEACEUS VAR. GLABRESCENS. 



Bromus hordeaceus glabrescens (Coss.) Shear. Studies ou Am. Grasses. 

 Bull. IT. S. Uept. Agrl. Div. Agros. 23: 20. 1900. 



Bromus mollis glabrescens Coss. Fl. Descr. Par. 654. 1845. 



DESCRIPTION. 



Smooth Spiked Soft Chess. An erect, pubescent annual, 1 to .? 

 feet (2-0 dm.) high, leaves Hat, panicles contracted, spikelets three to 

 eight-flowered, spikelets glabrous or only scabrous. The flowering glumes 

 obtuse, awns 3 to 4 lines (6-8 mm.) long. May to August. 



In fields and waste places, a troublesome weed. See figure 208, on 

 page 296. 



DISTRIBUTION. 



Iowa. Ames (Pammel, Hodson, Craig); Council Bluffs (Pam- 

 mel). 



North America. Introduced on the Atlantic, and common on the 

 fie Coast. 

 General. Europe, Germany, France. 



11. BROMUS MARGINATUS. 



Bromus marginatus Nees. Steud. Syn. PI. Gram. 322. 1854. Shear. 

 Bull. U. S. Dept. Agrl. Div. Agros. 23: 53. /. 33. 1900. 



Bromus breviaristatus (Hook.) Buckl. Beal. Grasses of N. A. 2: 

 623. 1896. Nash in Britton and Brown. 111. Fl. 1: 223./. 518. 1896. 



Bromus paucitlorus Nutt. in Herb. Acad. Nat. Sci. Phil. f. 33. 



DESCRIPTION. 



Short- Awned Chess. An erect, tufted, rather stout, short- 

 lived perennial. Culm 3 to 6 feet (6-12 dm.) high, mostly 

 puberulent or pubescent. Sheaths pilose-pubescent; ligule 

 \y 2 to \Yx lines (3-3.5 mm.) long, subrotund, laciniate; 

 blades broad, linear-lanceolate, somewhat sparsely pilose-pu- 

 bescent throughout, rather rough and coarse, 1 to 2 feet (1.5-2.5 



