FLORA OF THE DISTRICT OF COLUMBIA. 85 



2. Sphenopliolis nitida (Spreng.) Scribn. 



Shaded hillsides; infrequent. May. Northeastern states, south to Ga. 



3. Sphenopholis pallens (Spreng.) Scribn. 



Rocky woods; frequent. May-June. Northern states, south to N. C. (Eatonia 

 pennsylvanica A. Gray.) 



32. AVENA L. 

 1. Avena sativa L. Oats. 



Cultivated as a cereal and escaped, especially where the grain is fed or handled. 

 Native of Eur. and Asia. 



33. ARRHENATHERUM Beauv. 



1. Arrhenatherum elatius (L.) Beauv. Tall oat grass. 



Meadows and waste places; infrequent. June- July. Cultivated as a meadow grass 

 and naturalized in waste places and grassland in the northern states and southward 

 to Tenn. ; native of Eur. 



34. DANTHONIA DC. 



Teeth of lemma acute or acuminate 1. D. spicata. 



Teeth of lemma bearing awns as long as the spiral section of the central awn. 



2. D. compressa, 



1. Danthonia spicata (L.) DC. 



Dry open woods and sterile hills; common. June. Northern states, south to N. C. 

 The species of Danthonia produce cleistogamous spikelets at the base of the lower 

 sheaths of the culm. 



2. Danthonia compressa Austin. 



Dry woods; infrequent; Great Falls; Takoma Park. June.. Me. to N. C. 

 Plant usually taller and panicle more open than in the preceding. 



35. CAPRIOLA Adans. 



1. Capriola dactylon (L.) Kuntze. Bermuda grass. 



Pastures and open dry ground; common. Summer. Cultivated as a pasture grass 

 •in the southern states and thoroughly naturalized as far north as Long Isl.; native of 

 Eur. (Cynodon dactylon L.) 



36. SPARTINA Schreb. 



1. SpartinamichauxianaHitchc. Cord-grass. 



Marshes and river banks; infrequent. Aug. Northern states, south to Va. {S. 

 cynosuroides of Ward's Flora.) 



37. GYMNOPOGON Beauv. 



1. Gymnopogon ambiguus (Michx.) B. S. P. 



Sandy open woods; infrequent; east of the fall line. July-Sept. Southern states, 

 north to N. J. (G. racemosus Beauv.) 



38. ELEUSINE Gaertn. 



1. Eleusine indica (L.) Gaertn. Goose grass. 



A weed in open dry ground, especially in yards and along paths; common. Aug.- 

 Sept. Eastern U. S.; naturalized from the Old World. 



39. LEPTOCHLOA Beauv. 



1 . Leptochloa fascicularis (Lam.) A. Gray. 



Wet soil; rare; Alexandria {Steele). Southern states, north to Mass. (Diplachne. 

 fascicularis Beauv.) 



