574 CLX. CYPERACEJE. RnvNcnospoRA. 



12. PSYLOCARYA. Torr. 



Flowers 5 . Glumes 00, imbricated all around, all fertile ; peri- 

 gynium ; stam. 2 ; filaments long, persistent ; style 2-cleft, dilated 

 oy tuberculate at base ; aehenium biconvex, crowned with the per- 

 sistent style. — Ste?ns leafy. Spikes lateral and termvial, cymose. 



P. sciRPoiDEs. Torr. 



St. slender, leafy, smooth, 3-sided, 5 — 9' high ; Ivs. linear, smooth, 3—5' 

 by 1", cauline about 2 ; cwus terminal^ and one from the sheath of each cau- 

 line leaf; spikes about 3""long, oblong-ovate, in small, loose clusters, 20 — 30- 

 flowered ; glumes chestnut-colored, thin, ovate, acute j ach. tumid, dark brown, 

 crowned with the long style, which is much dilated at base. — Borders of ponds, 

 Smithfield, R. I., Olney ! Mass., Greene. Rare. 



13. RHYNCHOSPORA. Vahl. 



Gt. pvv^o;, a beak, cnropa, seed ; from the character. 



Flowers 5 or c? 5 9, few in each spikelet ; glumes loosely imbri- 

 cated, the lowest small and empty; perigynium of 6 — 12 bristles; 

 stam. 3 ; style bifid ; aehenium lens-shaped or subglobose, crowned 

 with the distinct, bulbous base of the style. — % Stem leafy, Z-sided. 

 Inflorescence terminal and axillary. 



* Acheniiivi smooth. 



1. R. alba. Vahl. (Schoenus albus. Linn.) White Bog-Rush. 



St. triangular above, very slender, leafy, smooth, 10 — 16' high ; Ivs. seta- 

 ceous, channeled; cori/mbose fascicles pedunculate, both terminal and from the 

 axils of the sheaths, with setaceous bracts ; spikekis lanceolate, acute at each 

 end, with crowded, lanceolate, white glumes. — In wet, .shady grounds ; com- 

 mon. Jnly — Sept. 



2. R. CAPiLLACEA. Torr. (Schcenus. Muhl.) 



St.G — 12' high, filiform, glabrous, triangular; Ivs. setaceous, much .shorter 

 than the stem ; spikelets 3 — 6, mostly terminal, oblong, each with a setaceous 

 bract; glumes chestnut-colored, with scarioiis edges; Imstles 6, much longer 

 than the oblong, substipitate aehenium ; tubercle about half the length of the 

 aehenium. — Swamps, N. Y., SartwcU, Penn., Muhl. 



3. R. FuscA. RcEm. & Schult. (Schcenus fuscus. Linn.) 



St. 3-angled, about 2f high ; Ivs. linear, carinate, smooth ; fascicles alter- 

 nate, pedunculate ; bracts setaceous, longer than the ovoid spikes; glumes brown, 

 ovate ; ach. brown, rugose, with an acute, black tubercle as long as the hi.spid 

 bristles. — Wet places, Mass. to N. J. Rare. 



4. R. GRACiLENTA. A. Gr. 



St. 1 — 2f high, very slender or filiform, smooth; Irs. linear-setaceous, 

 much shorter than the stem ; corymbs small, fasciculate, the lateral on slender 

 peduncles cxserted from the sheaths; spikelets ovoid; glumes ovate, acute, dark 

 brown; bristles 6, a third longer than the roundish-ovoid aehenium; tubercle 

 flat, dilated at base. — Dry grounds, N. Y. to Car. 



5. R. Gi.OMERATA. Vahl. (Schcenus. Linn.) 



St. slender, smooth, leafy, a foot or more high ; Ivs. flat, carinate, rougn- 

 edged ; corymbed fascicles very remote, in pairs, axillary and terminal ; spikelets 

 lanceolate ; gluvies keeled, mucronate, brown ; ach. obovoid or cuneiform, very 

 smooth, as long as the tubercle ; setce 6, rough, backwards. — In bogs, Can. to 

 Flor. July, Aug. 



6. R. CEPHALANTHA. A. Gr. 



St. 2 — 3f high, triangular, stout ; Ivs. linear, very narrow, the lower and 

 radical nearly as long as the stem ; hds. roundish, axillary and terminal, soli- 

 tary or rarely two together ; spikelets lance-oblong ; glumes ovate-oblong, dark 

 brown ; bristles 6, twice longer than the aehenium ; ach. roundish-ovoid, a little 

 compressed, very obtuse. — N. J. pine barrens. 



