CYPEltACK.li. (SEUGE FAMILY.) 5tl 



•<- ■*- Involucre a short aid-sltaped hrnct : culms tufted (3'- 12' hi(jk) , Jil [form. 



2. S. csespitdsus, L. Culms tcntc, wiry, densely slieathed at the base, in 

 compact turfy tufts ; the upper sheath bearing a vei*y short awl-shaped leaf; spike 

 ovoid, rusty-color ; involucral bract a rigid-pointed scale, resembling the lowest 

 proper scale of the spike and scarcely surpassing it ; bristlis G, smooth, longer 

 than the abruptly short-pointed achenium. — Alpine tops of the mountains of 

 Maine, New Hampshire, and N. New York. On Roan Mountain, N. Carolina. 

 Also, away from mountains, Bergen Swamp, Genesee Co., New York, G. W. 

 Clinton, J. A. Paine. N. Illinois, Dr. Vasei/. (Eu.) 



3. S. Clintdnii, Gray. Culms acutely triangular, almost bristle-like ; 

 sheaths at the base bearing a very slender almost bristle-shaped leaf shorter (usu- 

 ally very much shorter) than the culm; involucral bract awl-shaped, mostly 

 shorter than the chestnut-colored ovate spike, which has pointless scales : other- 

 wise as the next. (S. planifolius, var. brevifolius, Torr.) — Rather dry plains. 

 New York, Jefferson Co., Dr. Crawe; near Buffalo, G. W. Clinton. June. 



4. S. planif61ius, Muhl. Culms triangular, leafy at the base ; the leaves 

 linear, flit, as long as the culm, and like it rough-edged ; involucral bract a bristle- 

 tipped scale usually overtopping the ovate or ol>long chestnut-colored spike, the 

 green midrib of the scales extended into sharp points; bristles of the perianth up-- 

 icardly hairy, as long as the pointless achenium. — Dry or moist ground. New 

 England to W. New York (G. W. Clinton), Penn., and Delaware. June. 



-t- 1- -I- One-leaved involucre more conspicuous, and as if continuing the culm. 



5. S. SUbterminalis, Torr. Aquatic- culms (l°-3° long, thickish-fili- 

 form) partly and the shorter filiform leaves wholly submersed, cellular ; the 

 filiform green bract 6" - 12" long, much surpassing the oblong spike ; scales some- 

 what pointed ; bristles 6, bearded downwards, rather shorter than the abruptly- 

 pointed achenium. — Slow streams and ponds, New Jersey and New England 

 to Michigan and westward. — Var. tereestris, Paine, Cat. Less tall; stem 

 and leaves firmer; fully-fruiting spike more turgid : growing chiefly emersed, in 

 a quaking morass, Litchfield, Herkimer Co., New York, ./. A. Paine. 



» * Spikes clustered (rarely only one), appearing lateral from the one-leaved involucre, 

 which 7-esembles the naked culm, seeming to be a continuation of it. 



+- Culm sharply triangular, stout, chief y from running rootsloiks : spikes many-flow- 

 ered, rusty brown, closely sessile in one cluster : sheaths at base more or less leaf- 

 bearing. ( Very rarely a second and smaller vnvlucral leaf) 



6. S. piingens, Vahl. Running rootstocks long and stout; culm sharply 

 3-angled throughout (l°-4° high) with concave sides; leaves 1-3, elongated 

 (4'- 10' long), keeled and channelled ; spikes 1 -6, capitate, ovoid, usually long 

 overtopped by the pointed involucral leaf; scales ovate, sparingly eiliate, 2-cleft 

 at the apex and awl-pointed from between the acute lobes ; anthers tipped ivith an 

 aivl-shapid minutely fringed appendage; style 2-c.left (rarely 3-clcft) ; bristles 2-6, 

 shorter than the obovate plano-convex and mucronate smooth achenium. (S. 

 triqueter, MicJix., not of Z. S. Americanus, Pers.) — Borders of salt and fresh 

 ponds and streams : very common. (Eu.) 



7. S. Olneyi, Gray. Calm S-wing-angled, luith deeply excavated sides, stout 

 (2° - 7° high), the upper sheath bearing a short Inangulur leaf or none; spikes 6 - 12, 



