506 ORDER CXLIL— GRAMINACE^E. 



scabrous. Panicle branching, nodding. Flowers by pairs. Glumes 

 hairy, colored, fringed at the summit. Palece hairy, the inner one with 

 a contorted awn. — 2£. Sept. — Oct. Dry soils. Very common. 3 — 6 

 feet. 



10. A. melanocar'pus, (Ell.) Stem erect, branching, glabrous. Leaves 

 scabrous, with the sheath hairy at the throat ; spikes clustered, man} r - 

 flowered, with the involucre bearing a long awn. Glumes 2, lanceo- 

 late, pubescent, colored. Palece small, membranaceous, with along con- 

 torted awn arising from the base. — If. Sept. — Oct. Pine-barrens. 

 2—3 feet. 



11. A. tetrasta'chyus, (Ell.) Stem erect, glabrous. Leaves long, 

 hairy on the upper surface ; sheaths hairy. Panicle slender, erect, ap- 

 pressed. Sheaths of the spikes long ; spikes usually 4. Glumes serru- 

 late, with a hairy involucre at the base. Flowers monandrous. — 2( 

 October. Pine-barrens. 2 — 3 feet. 



