32 Class III. Order III. 



Syn. ROELERIA TRUNCATA. Torrey. 

 Woods, Watertown. June. 



36. UNIOLA. 



UNIOLA s PIC AT A. L. Spike grass. 



Somewhat spiked ; leaves involute, rigid. L. 



A common grass of the salt marshes. Stem a foot high, 

 round, smooth. Leaves of the stem numerous, short, smooth, 

 increasing in frequency upward, the upper ones hardly an inch 

 apart, rolled up so as to acquire a setaceous form, commonly 

 investing, and often overtopping the spike. Spike irregular, 

 about an inch long, consisting of ten or a dozen small, compress- 

 ed, crowded spikelets. Glumes flattened, sharp on the back. 

 July. Perennial. 



37. DACTYLIS. 

 DACTYLIS GLOMERATA. L. Orchard grass. 



Panicle crowded, leaning one way. Sm. 



Root perennial. Culms round, rough toward the top. Leaves 

 very* rough. Stipules cloven or torn. Panicle of flowers con- 

 sisting of close bunches on rough and rigid peduncles ,- leaning 

 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. 



38. 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. 



