."»f)8 GKAMINK.K. ((JHASS FAMILY.) 



less. Glumes 2, incmliranaccoiis. very iincqtuil ; tlie larfjjcr tipper one with a 

 sprcadiiif; a.\vn or tulK'rele on the liaek. I'alea; of ilie perfect ilower nieinliruiia- 

 ceous ; tlie lower one awned l)elo\v the apex, and di'iisely eiliate on the niar;;ins. 

 Stamens 3. Ovary smooth. Styles terminal : stit,'mas elongated, plumose, with 

 simple liairs. Grain free. 



1. C. Americanum, Sprang. Koot pungent ; culm (2°-3<' iiigh) rough, 

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

 j^lume granular on tiie back ; the stout awn spreading horizontally. (Mono<'era 

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

 Aug. U- 



21. DACTYLOCTENIUM, Willd. Ckowfoot-Guass. 



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 racliis ; the upjjennost flower imperfect. Glumes 2, comjjressed-keeled, 

 membranaceous ; the upper (exterior) awn-iK)inte(l. Palese 2, boat-shaped, 

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

 ish, rugose, free. 



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

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

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

 merous, 1° high. Spikes l'-2' long. 



22. ELEUSINE, G.Trt. 



Characters chiefly of Dactylottenium, but the narrower glumes and {)aleie 

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

 imbricated. — Low annuals. 



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

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

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



23. LEPTOCHLOA, Beauv. 



Flat-Icaved 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. Pale^e 2, membrana- 

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

 Stamens 3. Grain oblong, free. 



§ 1. LEPTOCHLOA Proper. — Lower paka unawned. 

 1. L. mucronata, 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 mucronate, longer or 

 shorter than the flowers : lower palea smooth, eraarginate. (Eleusine mucro- 

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



