3YPERUS. TRIANDRIA. MONOGYNIA. Gl 



margined, rather acute, keeled ; stamens 2 ; style 2-cleft ; 

 seed oval, compressed. Torrty Cat. pi. New-Yurk^ 

 p. 90. 



Root fibrous, perennial. Culm very slender, 8 — 12 inches high, 

 reclining or decumbent ; generally solitary. Leaves few, 

 shorter than the culm, membranaceous, bright green. Umbel 

 simple; sometimes without rays, the spikelets appearing fas- 

 cicled into a loose head. Involucrum unequal ; the longest 

 leaves 6 or 7 inches long. Glumes membranaceous, much 

 compressed, with a distinct, chesnut-coloured margin ; carina 

 green. Stamens always 2. Style very long. Seed grey, 

 smooth. 



Hab. In wet salt-marshes. Hoboken and elsewhere. Sep- 

 tember. 



5. C. dentatus^: umbel compound (6 — lO-rayed;) in- 

 volucrum 3-leaved, longer than the umbel ; spikelets 3 on 

 each ray, alternate, ovate, compressed, 8-flowered ; glumes 

 acute, nervose, spreading at the points ; seed triquetrous. C. 

 jtarvijiorus Muhl. Gram. p. 19. 



Root creeping, fibrous ; the fibres terminated by little tubers. 

 Cuhyi about a foot high, triquetrous, leafy at base. Leaves 

 linear, smooth. Rays of the umbel nearly erect, unequal, tri- 

 angular, ochreate at the base. S/iikes generally nmch com- 

 pressed, appearing dentate or pectinate by the spreading of the 

 points of the glumes when old, sometimes vivipaious, and then 

 nearly terete. Glumes ovate, brownish, margined. Siame7is 3. 

 Style 3-cleft. 



Hab. On the banks of rivers and in sandy swamps. In the pine- 

 barrens of New-Jersey. In Pennsylvania. Muhlenberg. 

 Rare. September. 



I have changed the name Muhlenberg gave this spe- 

 cies, because Vaht had previously called a different plant C. 

 fiarviflorus. 



6. C. erythrorhizos Muhl.: umbel decompound; invo- 

 lucrum 3 — 6-leaved, very long ; spikes alternate, linear, ho- 

 rizontal, about 12-flowered, nearly terete ; style 3-cleft ; seed 

 triquetrous. Muhl. Gram. p. 20. Cat. pi. Mew-York^ 

 p. 13. 



Root fibrous, of a dark red colour. Culm triangular, about a 

 foot high, leafy at the base. Leaves as long as the culm, 2 — 3 

 lines broad. Umbel of 3 — 4 primary rays, each divided into 2 

 or 3 others, which are without smallei' involucru. Involucrum 

 with 2 of the leaves several times longer than the umbel, 

 rough. Sfiikelets narrow-linear, about an inch long, nearly te- 

 rete when mature. Glumes ovate, acute, brown. Stameyis 3. 

 Seed ovate, white. 



H/vB. On the borders of ponds, on the banks of rivers^ Sec. 

 New-York to Pennsylvania. August — September. 



