558 GRAMINEZ. (GRASS FAMILY.) 
less. Glumes 2, membranaceous, very unequal; the larger upper one with à 
spreading awn or tubercle on the back. Pales 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°- 39 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. Jj. 
21. DACTYLOCTENIUM, Willd. Cnowroor-Gnass. 
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-pointed. Pales 2, boat-shaped, 
pointed. Stamens 3. Stigmas plumose, with branching hairs. Grain round- 
ish, rugose, free. 
I. D. Agyptiacum, Willd. Culms ascending from a creeping base; 
leaves fringed ; spikes commonly 4, awn-pointed ; spikelets 3-flowered. (Eleu- 
sine ? cruciata, EU.) — Cultivated ground, common. Introduced. — Culms nu- 
merous, 1° high. Spikes 1/— 2! long. 
22. ELEUSINE, Gert. 
Characters chiefly of Dactyloctenium, but the narrower glumes and pales 
obtuse and awnless. Stigmas plumose, with simple hairs. Spikelets closely 
imbricated. — Low annuals. 
1. E. Indica, Gert.— 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, Beauy. 
Flatleaved 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. Pales 2, membrana- 
. €eous; the lower one longer than the upper, 3-nerved, awned or unawned. 
