235] FLORA OF COLUMBIA AND VICINITY 93 



86. A. hyemalis (Walt.) B. S. P. \_A. scairaWiM.l Hair 



GRASS. 



Dry woods and thickets, but occasional in low grounds. 

 North America and Siberia. 



38. AVENA L. Oat. 



87. A. sativa L. Common oats. 



A commonly cultivated grain, escaping occasionally into 

 waste places. 

 Old World, thence to the New. 



39. ARRHENATHERUM Beauv. Oat grass. 



88. A. avenaceum Beauv. \_A.elaiius (L.) Beauv.]. 

 Meadows and along streets. 



Europe, thence to North America. 



40. DANTHONIA DC. Wild oat grass. 



89. D. spicata (L.) Beauv. 



Sterile hills, where it is often the prevailing grass. 

 Newfoundland to North Dakota; North Carolina to 

 Texas. 



41. SPARTINA Schreb. Marsh grass. 



go. S. cynosuroides (L.)Willd. Freshwater cord grass. 



Rare along Hinkson creek. 



Nova Scotia to Assiniboia; New Jersey to Texas, Ore- 

 gon and California. 



42. SCHEDONNARDUS Steud. 



91. S. Texanus Steud. [i". paniculaius (Nutt.) Trelease]. 

 Along the railroad at Rocheport. 



Illinois to Assiniboia; Missouri to Texas and New 

 Mexico. 



43. BOUTELOUA Lag. [ATHEROPOGON 



Muhl.]. Mesquite grass. 



92. B. racemosa Lag. [B. curtipendii/a (Michx.) Torn: 

 A. curtipendulus (Michx.) Fourn.]. Tall mesquite. 



Dry open hills and summits of cliffs. 

 Ontario to Manitoba; Georgia to Arizona; Mexico: 

 South America. 



