558 GKAMINEiE. (GEASS FAMILY.) 



less. Glumes 2, membranaeeons, very unequal ; the larger upper one with a 

 spreading awn or tubercle on the back. Palese of the perfect flower membrana- 

 ceous ; the lower one awned below the apex, and densely ciliate on the margins. 

 Stamens 3. Ovary smooth. Styles terminal : stigmas elongated, plumose, with 

 simple hairs. Grain free. 



1. C. Americanum, Spreng. Root pungent; culm (2° -3° high) rough, 

 like the narrow leaves ; spike at length recurved or coiled (3' -4' long); upper 

 glume granular on the back ; the stout awn spreading horizontally. (Monocera 

 aromatica, Ell ) — Low pine barrens, Florida to North Carolina. July and 

 Aug. U- 



21. DACTTLOCTENIUM, Willd. Ceowfoot-Grass. 



Annual creeping or spreading branching grasses, with flat leaves and digitate 

 rarely single spikes. Spikelets 2 - several-flowered, crowded on one side of the 

 flattened rachis; the uppermost flower imperfect. Glumes 2, compressed-keeled, 

 membranaceous ; the upper (exterior) awn-pointcd. Palete 2, boat-shaped, 

 pointed. Stamens 3. Stigmas plumose, with branching hairs. Grain round- 

 ish, rugose, free. 



1. D. -Slgyptiacum, Willd. Culms ascending from a, creeping base; 

 leaves fringed ; spikes commonly 4, awn-pointed ; spikelets 3-flowered. (Eleu- 

 sine ? cruciata, Ell.) — Cultivated ground, common. Introduced. — Culms nu- 

 merous, 1° high. Spikes 1'- 2' long. 



22. ELEUSINE, Gsert. 



Characters chiefly of Dactyloctenium, but the narrower glumes and palcte 

 obtuse and awnless. Stigmas plumose, with simple hairs. Spikelets closely 

 imbricated. — Low annuals. 



1. E. Indica, Gsert. — Cultivated ground, very common. Introduced. 

 Culms (6' -18' high) flattened; leaves flat; spikes 2 -several, the lower ones 

 sometimes scattered (2'- 4' long) ; spikelets 6-flowered. 



23. LEPTOCHLOA, Beauv. 



riat-leaved grasses, with the numerous spikes disposed in a terminal raceme. 

 Spikelets sessile, loose on one side of the elongated filiform rachis, 3 - many- 

 flowered. Glumes 2, membranaceous, unequal, keeled. Palese 2, membrana- 

 ceous ; the lower one longer than the upper, 3-nerved, awned or unawned. 

 Stamens 3. Grain oblong, free. 



5 1. LEPTOCHLOA Proper. — Lower palea unaumied. 

 1. L. mueronata, Kunth. Culms 20-3° high; sheaths of the broad (4"- 

 6" wide) rough leaves hairy; spikes numerous, in an elongated raceme, 2' -4' 

 long, spreading; spikelets minute, 3-4-flowered; glumes mncronate, longer or 

 shorter than the flowers : lower palea smooth, emarginate. (Eleusine muero- 

 nata, Mkhx.) — Cultivated fields, Florida, and northward. Aug.- Sept. ® 



