36'2 OKDEK 154. CYPERAUKdfi. 



7 S. Siiiithii Gr. Uulra slender, 312'; sheath often with a short blade ; spk. 1- .,. 



ovoid, greenish, 2 8", sessile about halfway up; setae 1; ach. smooth, lenticu- 

 lar; culm-leaf always erect Shores, Penn. (Porter) Sodus Bay (Hankenson,.) 



8 S. vaJidus Yahl. Culm cylindric, smooth, 5- 8f, its sheath with or without a short 



blade ; panicle cymous, overtopping the short pungent culm-leaf; spk. ovoid, brown. 

 2", numerous ; gls. mucronate, ciliate ; setse 3 or 6. Our stoutest Bullrush. Shores 



9 S. puiigens Vahl. Calm 1 4f, 3-angled, 1-3-leaved ; Ivs. 3 12', also 3-angled 4 



spk. 1 6, crowded, sessile, ovate, obtuse, S f/ below the summit ; gls. notched and 

 mucronate ; anth. ciliolate at apex ; style 2-cleft ; setae 2 6. Ponds and marshes. 



JOS. Torreyl Olney. Culm 2 3f, 3-angled ; Ivs. 13 at bawe, 1 IJf, 3-angled ; spk. 

 1 4, oblong, sessile, 2 4' below the summit; gls. ovate ; sty 3-cleft ; ach. triq 

 obovate, pointed, shorter than the setae. Borders of ponds, N E. to N. J., and W. 



118. Olneyl Gr. Culms triquetrous-winged, 2 7f, leafless, or with 1 very short leal 

 at base; spk. fi 12, in a sessile head an inch or so below the summit; gls. round- 

 ovate, mucronate : setae ti; style 2-cleft. Salt marshes, E. and S. 



12 S. leptolepls Chapm. Culms 3-angled, 2 5f; leaves 1 3, slender, channelled, 

 sheathing at base ; spikes loosely umbelled, single, oblong, 4 G", Co-flowered; 

 invol. of several small bracts besides the long culm-leaf; gl*. lance-ovate, acute; 

 style 3-cleft; setae 6. equalling the 3-sided ach. Md. (Porter), and 8. (S. Canbyi Gi.) 



13 S. maritimus L. Culm acutely 3-angled, leafy, 1 3f; Ivs. broad-linear, chan 

 nelled, 1 3^f; spk. 312", oblong, 6 10 in each cluster; clusters 19, sessile and on 

 short rays ; invol. of 2 or 3 very long leaves ; setae 1 4, deciduous, phort ; achemuro 

 plano-convex, Salt marshes. 



14 S. fluviatill* Gr. Culm triqiietroi:f-winsred, leafy, 2 4f; Ivs. as in No. 13; spk 

 6 10", oblong, 15 in a cluster; clusters sessile and on rays ; setae 6; ach. 3-angled 

 Shores, Eastern, Middle, and Western States. 



15 S. atrovirens Mnhl. Culm obtusely S-ana r lcd, leafy, 2f; invol. ol 3 long leaves, 

 spk. ovate, 1 J", 10 2:) in the round dense heads ; hds. 4" in a compoi nd cyme ; dark 

 olive-green ; setae 4, as long as the smooth white ach. Com. in swales. N., M., & W. 



16 S. sylvaticus L. Culm 3f, leafy; invol. of 8 leaves, hardly equalling the thrice 

 compounded cyme ; spk. 1", olive-grcn. 1 3 in the small heads; hds. on slendei 

 pedicels ; gls. acute ; setae 6, straight, a* long as the pale 3-angled ach. Mts. N. H., & N 



17 S. polyphyllus Vahl. Culm 2 3f, leafy ; invol. of 3 leaves ; cyme decompound 

 spk. yellow-ferruginous, 1", 3 6 in the clusters : gls. obtuse ; ach. yellowish-white 

 3-ang-lcd, twice Miorter than the 4 5 tortuous setae. Margins of waters. Raro. North 



18 S. cliv- rioalii* Ell. Culm 3 4f, very leafy; cyme large, loose, decompotmd 

 spk. all separate, 2 3", oblong, pendulous, ferruginous: setae tortuous. Wet bai'reus.S. 



19 S. Ri-inplioritin MX. Cnlm teretish. 3 5f, Ivs. 2f: tnvol. 4-5-lvd., longer than 

 the large loose decompound cyme; spk. very numerous. 1 3", pedicellate; setae 6. 

 hair-like, curled, conspicuous, 5or6 times longer than the \vhiteach. Swamps. Com. 



20 S. I in our I* MX. Culm 3-angled, 2 3f, very leafy; cymes term, and axillary, de 

 compound, at length nodding; invol. 1-3-bracted, much shorter than the cyme; ettai 

 as long as the glumes, hardly at maturity exserted. Swamps. Common. 8. 



7. ERIOPHORUM, L. COTTON GRASS. Glumes imbricated all 

 annmd into a spike. Ach. invested with many (rarely but 6) very long, 

 woolly or cottony hairs. U Culms with or without leaves. Spikes Showy 

 after the long setae have grown. June August. 



S Setae 6, crisped, woolly. Spike sirgle. Culms scape-like, naked No. 1 



S Setae numerous, straight, cottony. Culm jointed. 1-3-leaved.... (a) 



a Spike single. Culm bearing 2 sheaths instead of leave* No 9 



a Spikes scvera), collected into a subsessile, capitate cluster No. 3 



a Spikes ^'vi'i.il, separate, in umbel-like cyiues Ncs. 4, f 



