ORDER CXLI. CYPERACE.E. 565 



§ 2. Spikes compound, androgynous, apex staminate. 



2. C. Muhlenber'gii, (Schkuhr.) Stem erect, angular, stout, scabrous 

 at the summit. Leaves linear, sheathing the stem. Spikes about 5, 

 ovate, crowded at the summit of the stem. Bracteal leaves setaceous, 

 longer than the spikes. Glumes mucronate, longer than the palese. 

 Palece 2-cleft at the summit. — If. May. Shady woods. 1 — 2 feet. 



3. C. sfarganoi'des, (Muhl.) Stem erect, nearly terete. Leaves nu- 

 merous, striate. Flowers in 6 — 8 sessile spikes, numerous. Bracts 

 longer than the spikes. Glumes mucronate. Palece expanding, serrate. 

 Fruit ovate, compressed, bifid, double the length of the glume. — If. 

 April — May. Damp soils. 1 — 2 feet. 



4. C. stipita'ta, (Muhl.) Stem erect, smooth, succulent. Leaves chan- 

 neled, ligulate. Spikes numerous, compound, bracteate, with the bracts 

 longer than the spikelets. Glumes membranaceous. Palece ovate, ser- 

 rulate. Fruit lanceolate, bidentate. — 2f. April — May. Wet lands. 

 1—3 feet. 



o. C. ro'sea, (Schkuhr.) Stem slender, slightly angled. Leaves linear. 

 Spikes 4 — 6, remote, the lowest one with a setaceous bract. Fruit 

 ovate, 2-toothed, ciliate. Glumes ovate, nearly as long as the paleaj. — 

 If. May. Damp woods. 10 — 12 inches. 



6. C. retboflex'a, (Muhl.) Stem slightly angled, slender. Leaves 

 nearly filiform, scabrous along the margin. Spikes 4 — 6. Glumes 

 ovate, shorter than the palese. Fruit ovate-lanceolate, bitentate, as 

 long as the glumes. — If. May. Dry soils. 10 — 12 inches. 



7. C. multiflo'ra, (Muhl.) Stem scabrous, 3-angled. Leaves nar- 

 row, rigid, longer than the stem. Spike compound, oblong ; spikelets 

 glomerate, ovate, oblong, obtuse. Glumes lanceolate, brownish. Fruit 

 ovate, acuminate, compressed, 3-nerved, serrulate on the margin, di- 

 verging when mature, shorter than the glumes. — If. May. Moist 

 lauds. 12 — 18 inches. 



8. C. cephaloph'ora, (Muhl.) Stem 3-angled, scabrous along the 

 margins, leafy at the base. Leaves linear, long. Spikes collected into 

 an elliptical head. Glumes ovate, mucronate. Fruit ovate, scabrous 

 on the margin. — 2f. May — June. Oak woods. Common. 2 — 3 feet. 



§ 3. Spikes 3 — 12, androgynous, staminate lowest. 



9. C. lepori'na, (L.) Spikes 3, nearly round, elliptic, attenuate, clus- 

 tered, green, tinged with yellow; fruit elliptic, compressed, acuminate ; 

 scales ovate, acute, glabrous. — Carolina and northward. 



10. O. scopa'ria, (Schkuhr.) Stem obtusely angled. Leaves linear, 

 with scabrous margins toward the summit. Spikes 5 — 8, alternate, el- 

 liptic, lowest one bracteate. Glumes ovate, membranaceous. Fruit 

 ovate-lanceolate, margined, smooth, bicuspidate, longer than the glumes, 

 nerved. — If. May. Swamps. 1 — 2 feet. 



11. C. fos'nea, (Willd.) Stem obtusely 3-angled, scabrous near the 

 summit, furrowed. Spikes numerous ; the lower ones compound, the 

 upper ones aggregated. Palece serrulate, larger than the ciliate glumes ; 

 the lowest bract largest, subulate. — If. May — June. Marshes. 1 — 2 

 feet. 



12. C. lagopomoi'des, (Schkuhr.) Stem erect, obtusely 3-angled, 

 scabrous toward the summit. Leaves sheathing the stem at the base, 



