ORDER CXLI. CYPERACEJ3. 557 



14. C. specio'sus, (Vahl.) Stem erect, angled. Leaves channeled, 

 serrulate. Spikes in corymbs ; spikelets subulate, 6 — 8-flowered, dis- 

 tichous. Involucre many-leaved, long ; involucels longer than the par- 

 tial umbels ; common peduncles sheathed at the base. — If. Aug. — 

 Oct. Wet places. 2 — 4 feet. 



15. C. filicul'mis, (Vahl.) (C. mariscoides, Ell.) Stem erect, glabrous, 

 naked. Leaves channeled, serrulate. Spikes in globose heads, termi- 

 nal ; involucre 3-leaved, long. Glumes compressed. — 11 . June — Sept. 

 Sandy soils. 1 foot. 



16. C. po^efor'mis, (Pursh.) Stem triquetrous, glabrous Leaves 

 linear, glabrous. Spikes fascicled, flattened ; involucre 3-leaved, 2 of 

 them long. Glumes ovate, yellowish. — 2£. July — Aug. Sandy fields. 

 6 — 8 inches. 



17. C. fascicula'tus, (Ell.) Stem triquetrous. Leaves setaceous, 1 

 or 2. Spikes many-flowered, in terminal fascicles ; involucre 2-leaved, 

 linear. Glumes with the keel green. — If. June — Aug. Middle Geo. 

 6 — 8 inches. 



18. C. tetrago'nus, (Ell.) Stem naked, angled. Leaves channeled, 

 serrulate. Umbels many-rayed. Spikes 3 — 5-flowered. — 2f . 2 — 3 ft. 



19. C. Ensle'nii, (Pursh.) Stem 3-angled. Leaves linear, scabrous 

 along the midrib and margins. Spikes corymbose, branching at the 

 base ; spikelets numerous, linear, crowded, brown ; involucre 8-leaved, 

 exterior one longest. — If. August — Sept. In wet places. 1 — 2 feet. 



Genus II.— MARIS'CUS. Vahl. 3—1. 

 (From the Celtic mar, a marsh.) 



Flowers in spikes, clustered in heads. Spikes 1 — 8-flowered. 

 Stamens 3. Style 2-cleft. Seeds and stem triquetrous. Seed 

 naked. 



1. M. ovula'ris, (Vahl.) (M. echinatus,'E\\.) Stem glabrous, obtuse- 

 ly 3-angled. Leaves linear, channeled, glabrous. Spikes 6 — 8-flowered, 

 linear-lanceolate, in globose heads ; flowers in 2 rows. Stamens usu- 

 ally 5. — June to Oct. Common. 1 — 2 feet. 



2. M. hetrofrac'tus, (Vahl.) Stem naked, pubescent, obtusely 3- 

 angled. Leaves pubescent, linear. Spikes 1 — 3-flowered, reflexed, col- 

 lected into an obovate head. Seed oblong, destitute of bristles. — June 

 — Aug. Cultivated lands. Common. 1 — 2 feet. 



3. M. cylin'dricus, (Ell.) Stem naked, pubescent, obtusely 3-angled. 

 Leaves linear, channeled, glabrous. Spikes 2 — 4-rlowered, crowded, 

 compressed. Glumes keeled, acute. Seed acute, without bristles. — 

 June — Aug. Common about cultivated fields. 2 — 3 feet. 



Genus III.— KYLLIN'GIA. Rottb. 3—1. 

 (In honor of Kylling, a Danish botanist.) 



Flowers distinct, arranged in a roundish spike, imbricate- 

 Glumes 2, I -flowered. Paleoe 2, longer than the glumes. 



1. K. monogufii'ala, (L.) Stem filiform, 3-angled. Leaves linear 

 heads single, inclining to one side ; involucre generally 3-leaved, one of 

 the leaves erect. — 2f . October. Lower Goo. 2 — 12 inches. 



