Class III. Order III. 21 



of leaves ; spike terminal, the two outer glumes as 



long as the spike. 



Var. ft. callosus. The two outer glumes obtuse and fleshy at 

 the tips. 



A low plant with very small spikes. The truncated glumes 

 with fleshy whitish tips, had led me to consider this a distinct 

 species, until 1 received similar specimens from Europe. On 

 the White mountains. July. Perennial. 



Subgenus SCIRPUS. Seed surrounded with bristles style 

 filiform, deciduous. 

 SCIRPUS AMERICANUS. Pers. Three sided Club rush. 



Culm nearly naked, triangular ; spikes few, late- 

 ral, conglomerate sessile ; glumes round-ovate, mu- 

 cronate. 



Syn. SciRPUS TRIQUETER. MX. 



Culm two or four feet high, sharply three cornered with con- 

 cave sides. It resembles S. triquetcr of Europe, very much, 

 but the spikes are fewer and farther from the top. -Salt marsh- 

 es. July. Perennial. 



SCIRPUS DEBILIS. Pursh. Weak stemmed Club rush. 



Culm round, striated ; spikes few, lateral, crowded, 



sessile, short-ovate. 



About a foot high; glumes broad, carinate. Wet ground and 

 edges of ponds. Augusc. Perennial. 



SCIRPUS MARITIMUS. L. Sea Club rush. 



Culm triangular, panicle clustered, leafy, terminal : 

 glumes pointed, torn into three segments. 



Syn. SCIRPUS MACROSTACHTUS. Lam. Mufit. 

 SCIRPUS ROBUSTUS. Pursh. 



Culm erect, smooth, one or two feet high, leafy at base. 

 Leaves linear, acute, rough on the margin. Hractes or floral 

 leaves several, very unequal in length. Panicle resting on these, 

 crowded, consisting of large sessile and pedunculated spikes, 

 ovate, conspicuous by their dull, chesnut colour and yellow an- 

 thers. The glumes are ovate, shining, slightly carinatod. divid- 



