558 GRAMINEJE. (GRASS FAMILY.) 



less. Glumes 2, membranaceous, 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 filiate on the margins. 

 Stamens 3. < 'vary 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 hack; the stout awn spreading horizontally. (Monoeera 

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

 Aug. U- 



21. DACTYLOCTENIUM, Willd. Crowfoot-Gr ass. 



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

 rarely single spikes. Spikclets 2 - several-flowered, crowded on one side of tin- 

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

 membranaceous ; the upper (exterior) awn-pointed. Pales 2, boat-shaped, 

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

 ish, rugose, free. 



^ 1. D. JEgyptiacum, Willd. Culms ascending from a creeping base; 

 leaves fringed ; spikes commonly 4, awn-pointed ; spikeleta 3-flowered. (Elen- 

 sine 1 crnciata, Ell.) — Cultivated ground, common. Introduced. — Culms nu- 

 merous, 1° high. Spikes l'-2' long. 



22. ELEUSINE, Gart. 



Characters chiefly of Dactyloctenium, but the narrower glumes and palen 

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

 imbricated. — Low annuals. 



—4. 1. E. Indica, Ga?rt. — Cultivated ground, very common. Introduced. 

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

 sometimes scattered (2' -4' long); spikclets 6-flowcred. 



23. LEPTOCHLOA, Beam-. 



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

 Spikclets 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, 8-nervedj awned or unawned. 

 Stamens 3. Grain oblong, free. 



$ l. LEPTOCHLOA Proper. — Lotoerpalea unowned. 

 -L.I. L. mucronata, Kunth. Culms 2°-3° high; Bheaths of the broad (4"- 

 6"wide)rough Leaves hairy; spike- numerous, in an elongated raceme, &-4? 

 long, spreading ; spikclets minute, 3- 4-flowered ; glumes mucronate, longer or 

 shorter than the flowers; lower palea smooth, emarginate. (Eleusine macro* 

 nata, Mirhr .) — Cultivated field?, Florida, and northward. Aug. -Sept. i 



