90 MISC. PUBLICATION 4 2 3, TJ. S. DEPT. OF AGRICULTURE 



2. Glyceria striata (Lam.) Hitchc, Biol. Soc. Wash. Proc. 41: 157. 



1928. 



Poa striata Lam., Tabl. Encycl. 1: 183. 1791. 

 Panicularia nervata (Willd.) Kuntze, Rev. Gen. PL 2: 783. 

 1891. 



White Mountain region (Apache and Navajo Counties), Oak Creek 

 (Coconino County), wet places at medium altitudes, June to August. 

 Newfoundland to British Columbia, southward to Florida, Arizona, 

 and northern California. 



3. Glyceria elata (Nash) Hitchc. in Jepson, Fl. Calif. 1: 162. 1912. 



Panicularia elata Nash in Rydb., N. Y. Bot. Gard. Mem. 1: 

 54. 1900. 



Oak Creek Canyon (Coconino County), Pinaleno Mountains (Gra- 

 ham County), Santa Catalina Mountains (Pima County), 5,000 to 

 9,000 feet, wet meadows and moist woods, August. Montana to 

 British Columbia, south in the moimtains to New Mexico, Arizona, 

 and southern California. 



This species closely resembles G. striata but has stouter, taller 

 culms and slightly larger spikelets= 



5. POA. Bluegrass 



Annual or perennial cespitose or rhizomatous grasses with open or 

 contracted panicles; leaf blades with boat-shaped tips; spikelets ovate 

 or oblong, few- to several-flowered; lemmas glabrous or pubescent on 

 the nerves, sometimes pubescent on the internerves, the intermediate 

 nerves usually obscure. 



The bluegrasses are palatable and nutritious forage grasses. In 

 Arizona/, muttongrass (P. jendleriana) and Bigelow bluegrass (P. 

 bigelovii) furnish good forage during winter and spring. Kentucky 

 bluegrass (P. pratensis) is a standard pasture grass and is cultivated 

 in lawns. Canada bluegrass (P. compressa) is cultivated in pastures 

 in the northeastern United States. Annual bluegrass (P. annua) is a 

 common weed in lawns. 



Key to the species 

 1. Plants annual (2). 



2. Panicles 7 to 15 cm. long, contracted, rather dense; lemmas webbed at base, 

 pubescent below on the internerves 1. P. bigelovii. 



2. Panicles 3 to 7 cm. long, open, the branches rather few-flowered, naked 



toward base; lemmas densely pubescent on the nerves, glabrous on the 



internerves, not webbed 2. P. annua. 



1. Plants perennial (3). 



3. Rhizomes present: See also P. jendleriana and P. longiligula with dense narrow 



panicles (4). 

 4. Culms strongly compressed; panicles narrow, rather dense. 



5. P. COMPRESSA. 

 4. Culms terete or only slightly compressed; panicles open (5). 



5. Lemmas copiously webbed at base, the intermediate nerves glabrous; 

 panicle pyramidal, the lower branches mostly in 5's, arcuate- 

 spreading 3. P. PRATENSIS. 



5. Lemmas not webbed at base, the intermediate nerves pubescent; panicles 

 oblong, the lower branches usually in 3's, rather stiffly ascending. 



4. P. GLAUCIFOLIA. 



3. Rhizomes wanting (6). 



