GRASSES OF IOWA. 251 



Weaver, 1159 Pammel) 3 Johnson County (Shimek) ; Webster City, 

 671, Missouri Valley, Logan (Pammel) ; Fayette (Fink); Alden 1168 

 (Stevens) ; Cedar Rapids (Shimek) ; Calhoun County (Rigg). 



North America. Fields and waste grounds, New Brunswick, Con- 

 necticut (Hartford County, F. Wilson), Massachusetts (Reedville, 

 Pammel), Michigan, (Grand Rapids, Crozier), Wisconsin (La 

 Crosse, Pammel), Missouri (Eggert), Nebraska (McCook, Pammel, 

 402) ; west to Idaho and Colorado (Denver and Golden, Pammel). 



General. Common in British Islands, France, Germany, north to 

 Norway and east to Russia and Asia. 



12. BRIZA. 



Briza L. Sp. PL 70. 1753. Endlicher. Gen. PI. 99. Bentham & 

 Hooker. Gen. PI. 3: 1194. Hackel in Engler & Prantl. Nat. Pflanz. Fam. II. 

 2: 72. /. 83. Scribner. Bull. U. S. Dept. Agr. Div. Agros. 20: 144. /. 113. 

 [Rev. Ed.l 



Spikelets many-flowered, rounded-ovate, or heart-shaped; rachilla 

 articulated above the empty glumes and between the florets; florets 

 crowded, the uppermost usually imperfect. Glumes membranaceous, 

 with broad, scarious margins, strongly concave, rounded on the back, 

 and more or less ventricose ; empty glumes 2, subequal, shorter than the 

 florets; floral glumes 3 to many-nerved, cordate at the base, awnless; 

 palea much smaller than its glume, obtuse, 2-kceled. Stamens 3. 

 Styles short, distinct; stigmas plumose. Annuals or perennials, with 

 flat or convolute leaves, loosely-flowered and open, or narrow and spike- 

 like panicles. 



There are 12 species of Briza native to Europe; also occurring in 

 northern Africa, Asia and South America; one species is naturalized in 

 the eastern states and on the Pacific coast. 



1. BRIZA MEDIA. 



Briza media L. Sp. PI. 70. 1753. Watson and Coulter. Gray. Man. 

 Bot. 663. pi. 10. (6ed.) Nash in Britton and Brown. 111. Fl. 1: 199. /. 

 455. Beal. Grasses N. A. 2: 520. Scribner. Grasses of Tenn. 7: 103. Bull. 

 U. S. Dept. Agrl. Div. Agros. 7: 274. f. 268. (3ed.) 



DESCRIPTION*. 



Quaking Grass. A slender, erect perennial, | to 2 feet (1.5-6 

 dm.) high, with rather short, flat leaf blades, and capillary, spreading 

 panicles, l\ to s inches ( 4 1 2 cm.) long. Sheaths shorter than the in- 



