FLOWERING PLANTS AND FERNS OF ARIZONA 103 



2. Spikelets awned; glumes rather prominently nerved, broadened above the 

 base (4). 



4. Glumes relatively thin, not indurate at base 4. E. glaucus. 



4. Glumes indurate at base, rather prominently bowed out (5). 



5. Awns flexuous, divergent, implicate; base of the glumes not terete. 



5. E. CANADENSIS. 



5. Awns straight, erect; base of the glumes terete, usually straw-colored. 



6. E. VIRGIN I< US. 



1. Elymus triticoides Buckl., Acad. Nat. Sci. Phila. Proc. 1862: 99. 



1862. 

 Navajo, Coconino, Yavapai, and Pima Counties, 2,500 to 7,000 

 feet, rocky hills, canyons, and open woods, May to October. Mon- 

 tana and Washington to Texas, Arizona, California, and Baja Cali- 

 fornia. 



2. Elymus condensatus Presl, Reliq. Haenk. 1: 265. 1830. 



Oak Creek, Yavapai or Coconino County {Rusby 908, 909)0, near 

 Prescott {Harrison 7203), dry plains and slopes, June to September. 

 Minnesota to Washington, south to Arizona and California. 



3. Elymus salina M. E. Jones, Calif. Acad. Sci. Proc. ser. 2, o: 725. 



1895. 

 North end of Carrizo Mountains, Apache County (Standley 7466), 

 Bright Angel Trail, Coconino County (Silveus 1923), dry hills. Wyo- 

 ming, Idaho, Utah, and Arizona. 



4. Elymus glaucus Buckl., Acad. Nat. Sci. Phila, Proc. 1862: 99. 



1862. 

 Coconino, Graham, Gila, Maricopa, and Pima Counties, 1,500 to 

 7,000 feet, open woods, thickets, and along streams, April to Septem- 

 ber. Ontario and Michigan to Alaska, south through Montana to 

 Arizona and California. 



5. Elymus canadensis L., Sp. PL 83. 1753. 



Apache, Navajo, Coconino, Yavapai, Cochise, and Pima Counties, 

 at medium altitudes, moist ground along streams, thickets, and open 

 ground, July to October. Quebec to Alaska, south to North Carolina, 

 Mississippi, Texas, Arizona, and California. 



A form with larger, stouter, scarcely nodding spikes, var. robusius 

 (Scribn. and Smith) Mackenz. and Bush {Elymus robustus Scribn. and 

 Smith), has been collected on the Hopi Indian Reservation {Hough 68). 



6. Elymus virginicus L., Sp. PL 84. 1753. 



Oak Creek, Coconino or Yavapai County, 3,200 feet {Rusby 909), 

 moist ground, low woods, and along streams. Newfoundland to Al- 

 berta, south to Florida and Arizona. 



21. SITANION. Squirreltail 



Tufted perennial with firm, narrow leaf blades and rather dense 

 bushy spikes; spikelets 2- to few-flowered; glumes firm, very narrow, 

 extending into long, scabrous, divergent awns, sometimes with a short 

 bristle from the margins; lemmas firm, rounded on the back, minutely 

 bifid, the midnerve extending into a long divergent awn. 



