34 CLASS III. ORDER III. 



toward one side. Calyx pubescent and rough, the inner valve 

 twice as large as the outer, and shortly awned. — June. — Peren- 

 nial. 



A coarse, but extremely hardy and productive grass, said to be 

 much more luxuriant here than in Europe. — By fences, thickets, 

 &c. — June, July. 



41. AVENA. 



^ Subgenus Danthonia. Lower valve of the corolla two toothed^ 

 with the awn between. 

 AvENA spicATA. L. Spiked Oat grass. 



Panicle simple, few flowered ; spikelets six or seven 

 flowered, shorter than the calyx ; lower valve of the 

 corolla hairy ; leaves subulate, the lower ones hairy 

 at the neck. 

 Syn. Danthonia sficata. Nutt. 



A common grass in dry sunny pastures. Culm a foot high, 

 slender, with short setaceous leaves. Calyx nerved, acute, 

 longer than the spikelet. Outer valve of the florets ending in 

 two bristles or teeth with a contorted awn between them. — 

 June. — Perennial. 



§§ Subgenus Arrhenathebum, Calyx two flowered, one bar- 

 ren and aivned. 



Avena elatior. L. Tall Oat grass. 



Panicle equal, nodding ; awn twice as long as the 

 flower ; culm geniculate, smooth ; root nodose. 



Syn. HoLcus avenaceus. Sm. 



Arrhenatherum avenaceum. Beauv. 

 A large valuable grass introduced by cultivation from Europe. 

 Panicle lax with brownish spikelets. Awn of the barren flower 

 much twisted. — Naturalized in some parts of the state. — June. 



42. POA. 

 Poa pratensis. L. Common Spear grass. 



Panicle spreading ; spikelets of four flowers; glumes 



