CYPERACE^E. 429 



6. R. cymosa Torr. : culm triquetrous, leafy ; cymes terminal and 

 axillary ; the terminal one much larger ; seed round-ovate, compress- 

 ed, transversely rugose ; tubercle conical. Sckanus cymosus Mild. 

 Mich. 



HAB. Swamps. Penn. to Car. July. 2j..Culm 1218 inches 

 high. Glumes broad ovate,, lower one mucronate. Bristles 

 shorter than the seed. 



7. i?. laxa VahL : culm triquetrous ; corymbs leafy, decompound, 

 loose ; spikes subulate ; seed obovate, pointed with the long persistent 

 style. R. longirostris Ell. Schccnus longirostris Mick. 



HAB. Swamps. Del. to Car. July. !. Culm 3 6 feet high. 

 Leaves 1 2 feet long. Bristles 6, shorter than the seed. 



10. MARISCUS. Vakl. 



Flowers distinct, in a somewhat imbricate spike. Glume 

 2-valved, unequal, 3-flowered. Palea 1. Style 3-cleft. Seed 

 triquetrous, naked. Triandria. Monogynia. 



1. M. retrofradus Vahl. : umbel simple ; rays long ; spikes obovate, 

 retrosely imbricate ; spikelets subulate, at length bent backwards ; in- 

 volucre 3-leaved. Scirpus retrofractus Linn. 



HAB. Wet grounds. N. Y. to Car. July, Aug. U- Culm 2 

 feet high, naked, triangular. Leaves linear, long. Umlcl with 

 6 8 unequal rays, longer than the involucre. 



2. M. ovularis VahL : umbel simple ; rays short ; spikes globose ; 

 flowers spreading. M. echinatus Ell. Killingia ovalaris Midi. Scir- 

 pus echinatus Linn. 



b. tenellus Torr. : culm acutely triangular, slender; involucre 



3 5-leaved, 3 of the leaves many times longer than the umbel. 



. HAB. Bogs and low grounds. N. Y. to Car. July, Aug. 24!. 



Root bulbous. Culm 618 inches high. Spikes forming a 



globose head. Style 3-cleft. 



11. FUIRENA. Linn. 



Glumes awned, imbricated on all sides into a spike. Palea 

 3, (or perianth 3-valved,) petaloid, cordate, awned, unguicu- 

 late. Triandria. Monogynia. 



1. F. squarrosa Mich. ; spikes clustered, (5 6,) ovate ; culm smooth; 

 leaves ciliate ; sheaths hairy ; valves of the perianth cordate-ovate. 



HAB. Bogs. N. J. to Car. Aug., Sept. If. Culm I 2 feet 

 high, angular, slender at the top. Spikes clustered into 2 

 heads, the lateral one upon a long peduncle. 



2. F. torreyana Beck : spikes 1 S, terminal; culm pubescent above; 

 leaves smooth ; throat of the sheaths hairy. F. squarrosa var. pumtia 

 Torr. F. pumila Spreng. 



,' HAB. Wet sandy places. N. Y. Torr. Aug. If. Culm 3-0 

 inches high, angular, smooth. Spikes generally 3, often soli- 

 tary. 



