15 CLASS III. ORDER II. 



D. Flowers grassy : valves of the calyx glume 

 like : corol 2-valved. 



SpartixVA. Calyx 2-valved, compressed, one 

 of them keeled and longer than the other: corol 

 2-valved. 3. 9 — cynosuroides, (salt-grass) peduncles 

 rough. 7l-^juncea, peduncles smooth. 11 — glabra, 

 valves of calyx mostly glabrous. 2/. 



Cenchrus. Involucre divided, echinate, 3 or 

 4-flowered : glumes 2-valved, 2-flo\vered : corol 

 2-valved, awnless : style 2-cleft, 4, 10 — echinatus 

 (hedgehog grass) spike conglomerate. 

 * Juncus, Galium. 



Order II. Digynia. 



The proper Grasses. 



A. Floivers perfect. 



1st. Glume X-flonuered. 



Oryzopsis. Calyx 2-valved, lax, obovate : co- 

 rol teretish-ovate, leathery : valves 2, outer one 

 awned at the apex : appendages 2, linear, chaffy, 

 4. 10 — asperf alias (mountain rice) leaves rough. 



Panicum. Calyx 3-valved, the third valve dor- 

 sal and very minute : corol 2-valved : infloresence 

 various. 4. 10 — crus-galli^ (cockfoot grass) spike 

 doubly-compound. — ^^/awcw/w, (panic grass) spike 

 terete. — verticillatiim, spike whorled. (2) — latU 

 folium^ leaves broad and hairy at the neck of the 

 sheath. 2/ — nitiduin, panicle very branching, flow- 

 ers minute. 



DiGiTARiA. Calyx 2 or 3-valved, concave ; the 

 outer one very small or none, the inmoj^ one of 

 the length of the corol : corol 2-valved^blong- 

 ovate, av/nless : style very long : spikes digitate, 

 linear : flowers in pairs. 4. 10 — sanguiyialis, (finger 

 grass) culm creeping, flowers imbricate. — dac» 

 tyloTiy scions creeping, spikes finger-formi %» 



