\i TRIANDRIA.— MONOGYN! A, 



seed obovate, rugose, much longer than the tu- 

 bercle. • 



HAB. Bogs. July 1/. Panicles spreading ; the upper 

 one larger ; glum, brown ; seed white. 

 u. R. cymosa: culm triquetrous, leafy ; cymes terminal 

 and axillary ; the terminal one much larger ; seed 

 round-ovate, compressed, transversely rugose ; tu- 

 bercle conical. 



HAB. Swamps. July. If. A foot or 18 in. high; 

 involucr. long, 2 — 3-leaved ; tubercle white ; bristles 

 short. 

 7. R. laxa: culm triquetrous ; corymbs leafy, decom* 

 pound,loose ; spikes subulate ; seed obovate, pointed 

 with the long persistent style. 



HAB. River swamps. July. If. Culm 3-6 ft. high; 

 corymbs very large. 



37. MARISCUS. Cyperoidece*. 

 , M. r etrofr actus : umbel simple; rays long ; spikes 

 obovate, retro rsely imbricate ; spikelets subulate, 

 at length bent backward ; involucrum 3-leaved. 



HAB. Wet meadows. Aug. — Sept. If . Culm nearly 

 naked, pubescent; umb. 6 — 8 rayed. 

 \ M. ovularis : umbel simple ; rays short ; spikes 

 globose ; flowers spreading. 



HAB. Boggy grounds. July — Aug. If. Root bul- 

 bous ; culm 6-18 in. high; spikes 3-5-1 ; middh 

 one sessile. 



j3. tenellus: culm acutely triangular, slender ; invo- 

 lucrum 3 — 5-leaved ; 3 of the leaves many times 

 longer than the umbel. 



HAB. Sea-coast. Aug. A foot high; heads of 10- 

 1 2 spikelets. . 



38: . DULICHIUM. Cyperoideaz. 



O.spathaceum: culm terete; leaves spreading in 



3 directions ; spikelets spreading. 

 HAB. Wet places. Aug. — Sept. U. Culm very leafy, 



terete below ; ochrece cylind. ; racemes axillary. 



39. CYPERUS. Cyprus-grass. Cyperoideaz. 

 \. C. infieccus: umbel 2 — 3-rayed, or conglomerate and 

 simple ; involucrum 3-leaved, very long ; spikeletsv 



