" ¥ RIANDRIA.— MONOGYNIA. 43 



collected into ovate heads, oblong, 8-flowered ;[ 

 glumes squarrose at the tip. 



HAB. Banks of rivers. Aug. — Sept. £ ? 2 — 3 in. 

 high ; odorous ; heads many-Jl. ; glum, striate, yellow- 

 ish. 

 8, C. flavescens : spikes linear-lanceolate, in fascicles oi 

 3 — 4; glumes obtuse ; style 2-cleft ; seed lenticular ; 

 involucrum 3-leaved, longer than the spikes. 



HAB. Boggy grounds. Aug. — Sept. y . A span 

 high ; spikelets 14-20-Jl., yellowish. 

 3. C. Kuttallii: culm acutely triangular ; umbel radiate, 

 or nearly sessile, loose ; rays short ; involucrum 

 4-leaved ; 2 of the leaves very long ; spikelets 

 linear-lanceolate, compressed, acute ; stamens 2 : 

 style 2-cleft ; seed oblong, obtuse, compressed. 



HAB. Borders of salt-marshes. Aug. — Sept. U . 



Cespitose, 5-12 in. high ; spik. very acute; glum. 



green and brown ; seed smooth. 



\. C. diandrus : culm slender, obtusely triangulav, ; 



umbel sessile, or 1 — 2-rayed ; involucrum 3-leaved ; 



2 of the leaves much longer than the umbel ; 

 spikelets lanceolate-oblong, much compressed, 

 many-flowered (14-16 ;) glumes margined, rather 

 acute, keeled; stamens 2; style 2-cleft; seed oval* 

 compressed. 



HAB. Salt marshes. Sept. U.. Culm weak, not ces- 



pitose ; glum, much compressed, with a brown mar- 



gin. 



>. C. dentalus: umbel compound, (6-10 rayed;) invor 



lucrum 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. 



1JAB. Banks of rivers and sandy swamps. Sept. U . 

 Root tub. ; spik. appearing dentate, brownish ; some- 

 times viviparous. 

 •i. C. erythrorhizos : umbel decompound; involucrum 

 3-6-leaved, very long; spikes alternate, linear, 

 horizontal, about 12-flowered, nearly terete ; style 

 3-cleft ; seed triquetrous. 

 HAB. Wet places. Aug. — Sept. y. . Root fib. red. 

 partial umb. naked ; spik. at length terete. 

 itrigom : spikelets linear, compressed, acute', 



