cyperacejE. 412 



2. R. glomera'ta. Vahl. Schoenus capitellus. Mx. 

 Stem slender, smooth, leafy, a footer more high; leaves flat, carinate, 



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

 spikelcts lanceoVdle ; glumes keeled, mucronate, brown ; a chtmum ohoyoiA 

 or cuneiform, very smooth, as long as the tubercle ; seta 6, rough, backwards. 

 In bogs. July. Aug. 



3. R. FUSCA. 



Stem 3-angled, about 2 feet high ; leaves linear, carinate, smooth ; fascicles 

 alternate, pedunculate ; brads setaceous, longer than the ovoid spikes ; glumes 

 brown, ovate ; acke^iium brown, rugose, with an acute, black tubercle as long 

 as the hispid bristles. Wet places. Rare. 



4. R. mackosta'chya. Torr. Ceratoschoenus. ejusd. 

 Axillary coriimbs subsimple, terminal ones compound ; upper spihclets dense- 

 ly fascicled ; ack. ovate, smooth ; bristles erectly hispid, twice as long as the 

 aclienium ; style persistent, nearly 4 times as long as the acheniurn. Mass. 



8. SCHCENUS. 

 Spikelets subconvolute, acute; ghimes imbricated all 

 around, the lowerones empty and dry; ovary roundish, with- 

 out setas. 



S. imariscoi'des. Dog rush. 



Stem terete, leafy, 1 — 2 feet high; haves channeled above, rnnnded be- 

 neath ; umbel terminal; fascicles of spikelets 3 on each peduncle, 10—15 

 spikelets in each ; glumes brown, ovate ; acheniurn rounded at base, crowned 

 with the remains of the style. Bogs. Mass. N. Y. July. 



Tribe 3. SCLEREiE. 



Flowers moncrxious or diclinovs. Achenium vaked (tcithout a perigynium), 



more or less hard and bony. 



9 . S C L E' R 1 A . 

 Flowers monoecious. 5/en7e.— Glumes 2 or 6, many-flow- 

 ered; paleae (inner glumes) awnless. Fertile. — Glumes 2 or 6, 

 1 -flowered, paleaj 6; stigmas 1—3; acheniurn colored, sub- 

 globose. 



S. triglomera'ta. Mah. Whip grass 



Stem erect, acutely triangular, rough, leafy, 3—4 feet high ; leaves linear- 

 lanceolate, rough-edged ; spikelets lateral and terminal, alternate, in about 3 

 Kubsessile fascil-lcs, "and much shorter than the leafy bracts; if/M?nfs ovate, 

 cuspidate, dark purple ; acheniurn globose, smooth and polished, white. 

 Swamps. Mass. June, July. 



Tribe 4. CARICE^. 



Floicers monac-ous, rarely diacious. Spikelets with the glumes imbricated all 



around. Micnium enclosrd in a persistent, ventricose sac, called perigynium, 



which is analogous to a perianth. 



10. CAR EX. L.* 

 Spikelets one or more, either androgynous (with both stam- 

 inate and pistillate flowers), or with the two kinds in separate 



* By Rev. Chester Dewey, D. D. See Preface. 



