CLASS in. ORDER II. 13 



Aristida. Calyx 2-valved : corol l-valved,with 

 3 awns at the tip. 4. 10 — dichotoma^ (beard grass) 

 culm forked. 



Alopecurus. Calyx 2-valved : corol 1-valved, 

 simple at the tip ; sometimes awned at the base. 4. 

 10 — ^/zra/ewsf5, (foxtail grass) culm erect. % — geni' 

 culatus, culm geniculate. 



Phalaris. Calyx 2.valved, valves keeled, ner- 

 ved, equal in length, including the 2-valved pilose 

 corol. 4. 10 — arujidinacea^ (ribbon grass) panicle 

 oblong, compact, leaves particoloured. %^ e. 



HoRDEUM. Calyx lateral, 2>valved, 1 or 2-flow- 

 Tcred ; florets in threes, the middle one sessile, lat- 

 eral ones often barren : corol 2-valved, acute, out- 

 er valve awned. 4. 10 — vulgare (barley) florets in 2 

 erect rows. e. — jubatum^ involucres bristle-form. 



Milium. Calyx 2 valved, l-flowered> ventri- 

 cose : corol 2-valvedj very short : stigmas pencil- 

 form. 4. 10 — effusum^ (millet) panicled, avvnless. e. 

 Agrostis. Calyx 2-valved, 1 -flowered, valves 

 acute : corol 2-valved : stigmas longitudinaily his- 

 pid or plumose, (florets spreading) 4. 10 — vulgaris 

 (red top) panicle spreading, glume calyx twice as 

 long as corol. 2/ — alba, panicle lax, culm creep- 

 ing — stricia^ panicle long, stiff and strait. 7l» 



Saccharum. Calyx involucred with long wool, 

 2-valved : corol 1 or 2-valved : stigmas 1 to 3. 4. 

 10 — officinarum (sugar cane) flowers panicled, 

 leaves fiat. ?/. 



Muhlenbergia. Calyx 1-valved, very minute : 

 corol 2-valved, base hairy, ouier valve awned at 

 the top : seed 1, oblong acuminate (Flowers pan- 

 iciea) 4. 10 — diffusa, glabrous : cu! \\ weak : pan- 

 icle slender, compact. 11 — erecta^ pubescent; culm 

 erect and firm : panicle lax. 



Leersia. Calyx ; corol 2-valved, closed ; 

 valves compressed, boatform, awnless. 4. 10 — ory* 



