ORDER CXLT. — CVrEUACE.E. T.."! 



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

 serrulate. Spikes in corymbs; spikelets subulate, G — S-floweri'd, dis- 

 tichous. Involucre many-leaved, loni^ ; involucels longer than tin; par- 

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

 Oct. Wet places. 2—4 feet. 



15. C. filicul'jiis, (Yahl.) {C. 7Jia,riscoiJcs,'E\\.) ^S^rm erect, glabrou?, 

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

 nal ; involucre 8-leaved, long. 6-7i«ncs compressed. — If. June — ^^ept. 

 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. G^/itmcs ovate, yellowish. — If. July — Aug. Sandy fields. 

 6 — 8 inches. 



1*7. C. fascicula'tus, (Ell.) Stem triquetrous. Leaves setaceous, 1 

 or 2. >Si/>« Ares 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 channeleil, 

 serrulate. £//n6e/s many -rayed. Spikes B — 5-flowered. — If. 2 — 3 ft. 



19. C. En.sle'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. — 2f. 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 tri(iuetrous. Seed 

 naked. 



1. M. ovula'ris, (Vahl.) {M. echinatus, Ell.) Stem glabrous, obtuse- 

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

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

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



2. M. retrofrac'tus, (Vahl.) Stein naked, pubescent, obtusely 3- 

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

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

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



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

 Leaves linear, channeled, glabrous. Spikes 2 — 1-tlowered, crowded, 

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

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



Genus III.— KYLLIN'GIA. Kottb. 3—1. 

 (In honor of Kylling, a Danish botanist) 



Flowers distinct, arranged in a roundish spike, inihncate 

 Glumes 2, 1-flovveretl. Palece 2, longer than the glumes. 



1. K. monoceph'ala, (L.) Stem filiform, 3-angled. Ltaves linear 

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

 the leaves erect. — If. October. Lower Geo. 2 — 12 inches. 



