22 Class III. Order III. 



ed into three small segments at tip, the middle one of which is 

 prolonged into a short, setaceous awn. Salt marshes and ditch- 

 es. July. Perennial. 



I do not discover sufficient grounds to separate this from the 

 European plant. 



SCRIPUS ACUTUS. Muhl. Pointed Bullrush. 



Culm round, leafless, equal ; spikes several, below 

 the top, oblong, somewhat umbelled. 



Syn. SCIRPUS VALIDUS. Pursh? 



SCIRPUS LACUSTRIS. Torrey ? 



This nearly resembles the large bullrush, (Scirp us lacustris) 

 but differs in its fructification, which is lateral, never terminal. 

 Culm sheathed at base, erect, round, smooth, naked, filled with 

 light, spongy pith, often spotted, five or six feet high, uniform 

 in size for a great part of its length, ending in an acute point. 

 Spikes several, in a cyme or umbel about an inch below the tip, 

 oblong and closely imbricate. Peduncles rough, compressed, 

 unequal ; scales ovate, mucronate, scarious at the edges, pubes- 

 cent. In deep water at Fresh Pond and elsewhere. June, Ju- 

 ly. Perennial. 



This is the largest rush in this vicinity. The name acutus 

 was given it by Muhlenberg. 



Sutgenus TRICHOPHORUM. Seed surrounded with 

 bristles much longer than itself. Style filiform, deciduous. 

 SCIRPUS ERIOPHORUM. Mich. Red Cotton grass. 



Culm obtusely triangular, leafy ; panicle decom- 

 pound, proliferous, nodding. 



Syn. ERIOPHORUM CTPERINUM. L. and first edit. 

 TRICHOPHORUM CTPERINUM. Pers. 



A common, rank, tall, meadow grass. Culm smooth, strong, 

 roundish, compressed on three sides. Leaves very long, rough 

 at the edge. Panicle terminal, umbelled, nodding, proliferous, 

 with a long leafy involucre. Spikelets in heads very numerous, 

 small, ovate, covered by the red, projecting, woolly hairs. 

 August. Perennial. 



Subgenus ISOLEPIS. Seed naked at base style simple, 

 not articulated, deciduous. 



