152 SPARTINA. 



2. A. Dichotoma (Poverty Grass) Dry, sandy or 

 gravelly fields ; common, especially southward. 



3. A. Gracilis (Slender Three Awned Grass). 

 Seldom found except on the poorest land ; of no 

 value for cultivation. 



4. A. Stricta (Downy Triple Awn), not cultivated. 



5. A. OligcmtJia, Mich. (Prairie Triple Awn). 

 Found by Michaux on the prairies of Illinois, also 

 found in Virginia and Southwestward. 



6. A. Paiyurascens (Purple Triple Awn), com- 

 mon irom Massachusettes to Illinois and Southward. 

 Not cultivated. 



7. A Lanata. Found in Marjdand and South- 

 ward. 



8. A. Ticberculosa^ (Long Awmed Poverty Grass). 

 Sandy soil, East Massachusetts to New Jersey, also 

 Wisconsin, Illinois and Southward. 



17. SPARTINA, Schreber. Coed or Marsh Grass. 



GENERIC CHARACTER. 



Spikelets 1 -flowered, without a rudiment, very 

 mucli flattened latterally ; spilled in 2 ranks on the 

 outer side of a triangular rhachis ; glumes strongly 

 compressed ; keeled, acute, or bristle pointed, 

 mostly rough-bristly on the keel ; the upper one 

 much larger, and exceeding the pointless and awn- 



