ORDER CXLII. — GRAMTXACE.f:. 5^5 



digitate, 3 — 5 ; paleoe longer than the riuliiiiont.— An iiitroJuccd grn»s. 

 Very difficult to exterminate, especially in loose, rich hoil. 



Bermuda Grass. iJiyltaria Jarti/lon, EIL 



Genus XX.— CHLO'RIS. Schwartz. 

 (From chloros, green, in allusion to its hcrbaye.) 



Flowers polygamous. Glumes 2, 2-flowered ; one of tliein 

 perfect and sessile, the other staminate. Paleie of the perfect 

 flower 2, awned. Sjjikes by fours, digitate. 



1. C. petr^'a, (EIL) {Enstachys pctrcca, Desv.) Stan prostrate, 

 brandling, assurgent, geniculate. Leaves glabrous, with the margins 

 and midrib st^rrulate. Glumes 2, 2-flowered ; extt-rior glume awned, 

 the interior smaller, keeled. Palea of the sterile floret concave, ob 

 tuse. — 1i. June — Aug. On the sea-coast. 



Genus XXI.— ELEUSI'NE. Gart 

 (From Eleusin, tlie name of a town Mhero Ceres was worsiil|)od.) 



Flowers on one side of the rachis. Glumes 2, unequal, 5 — 7- 

 flowered. Palece 2, obtuse, upper one bifid. Scales fimbriate. 

 Spikes digitate. 



1. E. muorona'ta, (Mich.) {Leptochloa mucronata, Kuntk) Stem 

 erect, glabrous. Leaves slightly scabrous, with hispi«l sheath.s longer 

 than the joints. Panicle long, with the spikes 4 — 5 inches long. Ghtmet 

 nearly equal, with colored keels. Paleie unequal, the exterior liairy. — 

 0. July— Oct. Cultivated lands. 1—3 feet 



2. E. in'dica, (Gffirt.) Stem decumbent, lucid. Leaves linear, with 

 the under surface glabrous, long ; sheaths pubescent, compressed. 

 Spikes usually 5, digitate, one below the rest ; spikdets usually o-flow- 

 ered. Glumes unequal, with tiie keels scabrous. — 1(. June — Uotuber. 

 Common. 1 — 2 feet. 



3. E. crucia'ta. {Dactyloetemum yEyyptiacum, Willd.) Stnn de- 

 cumbent and assurgent, glabrous. Leaves narrow, ciliate. Spikes 2 — 

 4; si)ikelets usually 3-flowered, the terminal one usually sterile or 

 •wanting ; extremity of the rachis naked. — Q. July. Conunoii. 12 — 

 18 inches. 



Genus XXII.— MONOCE'RA. Ell. 

 (From memos, one, and keros, liorn ; tlioro bolng but one spiko.) 



Flowers polygamous, on one side of the rachis. GInmcs 2, 

 many-flowered, awned below the summit. Pale^'e of the per- 

 fect flower 2-valved, unequal ; the e.xtcrior one awned Mow 

 the summit; those of the sterile flower unawned. 



1. M. aromat'ica, (Ell.) {Ctenium Americanum, Sprig.) .SV<//j pu- 

 bescent, erect. L^eaves scabrous on the upper surface, glahrotis W- 

 neath; sheaths shorter than the joints, hairy at the throat. SpH't ter- 

 minal, secund ; spikelets in 2 lows. Glumes 3-flowered; the exterior 

 glume with an awn projecting iVotu the center of the l)ack ; the in'criur 

 palea .small, pubescent. — U- May — Julv. rine-barren*. 



Toothiichr-^ra**. 



