20 Class III. Order III. 



SCIRPUS TENUIS. Muhl. Slender Club rush. 



Culm filiform, quadrangular, leafless ; spike termi- 

 nal, oval, acute at both ends ; glumes obtuse ; sta- 

 mens three, styles three cleft. 



A slender, leafless, acute-angled species. Common in wet 

 grounds and shallow water. May, June. 



SCIRPUS PALUSTRIS. L. Marsh Club rush. 



Culm rounded, inflated ; spike terminal, oblique, 



oblong, acute ; glumes acute ; root creeping. 



Culms stout, slightly compressed, many from the same root, a 

 foot high, leafless, with blunt sheaths at base. Lower glumes 

 larger. Wet meadows and ditches. July. Perennial. 



SCIRPUS CAPITATUS. Willd. Headed Club rush. 



Culm roundish ; spike terminal, roundish ovate, 

 obtuse, seed smooth: 



Distinguished from the foregoing by its obtuse and almost 

 globular heads. Small ponds, &c. July. 



SCIRPUS TRICHODES. Muhl. Hair Club rush. 



Culm setaceous compressed, grooved ; spike ter- 

 minal, ovate, acute, naked, stamens three, style bifid. 



An exceedingly slender and hair-like species, three or four 

 inches high, related to S. acicularis of Europe, and considered 

 by Dr. Torrey to be identical with it. About shallow water. 

 July. 



SCIRPUS PLANIFOLIUS. Muhl. Flat leaved Club rush. 



Culm triangular ; leaves linear, flat, about equal 



to the culm ; spike terminal, oblong, compressed, 



shorter than its bractes. 



A small species in wet grounds, the radical leaves as high as 

 the culm. Bractes cuspidate, the outer one longer than the 

 spike. May, June. 



SCIRPUS C^SPITOSUS. L. Scaly Club rush. 



Culm rounded, sheathed at base with rudiments 



