152 SPAETINA. 



3. 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. OligantJia, Mich. (Prairie Triple Awn). 

 Found by Michaux on the prairies of Illinois, also 

 found in Virginia and Southwestward. 



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

 mon irom Massachusettes to Illinois and Southward. 

 Not cultivated. 



7. A. Lanata. Found in Maryland and South- 

 ward. 



8. A. Tuberculosa, (Long Awned Poverty Grass). 

 Sandy soil. East Massachusetts to New Jersey, also 

 Wisconsin, Illinois and Southward. 



Ylr SPARTINA, Schreber. Coed oe Maesh Geass. 



GENEEIC CHAEACTEE. 



Spikelets J -flowered, without a rudiment, very 

 much flattened latterally ; spiked 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- 



