CYPERACEiE. 401 



axillary and terminal, often in pairs ; spikelets oblong-lanceolate ; bristles 

 hispid, twice as long as the orbicular-obovate margined achenium. 



Sandy swamps. N. Y. to Flor. and Louis. Aug. %. — Culm obtusely trian- 

 gular, stout. Leaves narrow-linear, flat. Scales dark brown, oblong, acute or 

 acuminate. Resembles the preceding, but has the heads larger and compact. 



Round-headed Beak Rtish. 



8. R. viacrostachya Torr. : culm triangular ; axillary corymbs simple, 

 terminal ones compound ; upper spikelets densely fascicled ; bristles 6, 

 hispid upward, twice as long— and the persistent style four times as long- 

 as the obovate achenium. 



Ponds. Mass. Ctilm 2 — 3 feet high, smooth. Leaves 1 — 2 feet long, smooth ; 

 the upper scabrous on the margin. Corymbs about 4. Scales fuscous, acute. 

 Subsequently referred by Dr. Torrey, with some doubt, to the genus Ceratoschoe- 

 nus Nees.—Torr. Cyp. Long-headed Beak Rush. 



♦ 9. R. corniculata Gray : culm- triangular ; corymbs decompound, diffuse ; 

 spikelets loosely fasciculate, subulate ; bristles mostly 6 ; achenium obovate, 

 pointed with the long persistent style. R. longirostris Ell. Schanus cor- 

 niculatus Lam. 



Wet places. Del. to Flor. W. to Ohio. July. %.—Culm 3—6 feet high. 

 Leaves 1—2 feet long, smooth, rough on the margin. Corymbs subumbellate, 

 axillary and terminal. ScaUs fuscous. Referred by Dr. Torrey to the genus 

 Ceratoschomus Nees. Long-styled Beak Rush. 



** Achenium transversely rugose. 



10. R. cymosa Nutt. : culm acutely triangular ; corymbs somewhat cymose, 

 terminal and axillary ; spikelets clustered, ovoid ; bristles 6, shorter than 

 the obovate subcompressed achenium : tubercle depressed-conic. Schcenus 

 cymosus Willd. 



Moist grounds. N. J. to Flor. and Louis. July. %.~Culm 12—18 inches 

 high, slender. Leaves linear, smooth. Spikelets in clusters of 3 — 5 at the end 

 of the peduncle. Scales fuscous, ovate ; the lower ones obcordate, mucronale 



Tufted Beak Rush. ' 



11. R. Torreyana Gray : culm slender, somewhat terete ; panicle corym- 

 bose, rather loose ; spikelets ovoid, mostly pedicellate : bristles 6, a little more 

 than half the length of the oblong-ovate compressed achenium • tubercle 

 compressed-conic. 



Wet grounds N. J. Torr. July, Aug. %— Culms 1—3 feet high, cespi- 

 pitose. Radical leaves long and rigid ; those of the culm shorter. Scales ovate, 

 fuscous. Torrey' s Beak Rush. 



15. PSILOCARYA, Tm.— Psilocarya. 



(From the Greek ^tXoj, naked, and Kapva, a nut ; the achenium being desti- 

 tute of bristles.) 



Scales imbricate on all sides, membranaceous or chartaceous, 

 all fertile. Perigynium none. • Stamens 2. Filaments long and 

 persistent. Style 2-cleft, compressed, dilated at base. Aclie- . 

 nium biconvex, crowned witli the broad persistent tubercle or 

 rostrate with the persistent style. 



P. scirpoides Torr. : spikes oblong-ovate, many-flowered^; scales lance- 



