CYl'EltACK.*:. (SEDGE FAMILY.) 505 



length of the bristles, four times the length of the depressed-conical, tubercle. 

 Low grounds, New Jersey to Virginia, and southward. 



2. R. Torreyana, Gray. Culm nearly terete, slender; haves bristle-form ; 

 cymes panieled, somewhat loose, the spikes mostly pedicelUd; acJienium oblong-obo- 

 vate, longer than the bristles, thrice the length of the broad compressed-conical 

 tubercle. Swamps ; pine barrens of New Jersey, and southward. 



3. R.. i lie \i>:'i lisa, Vahl. Culm triangular, slender; leaves narrowly lin- 

 ear ; spikes spindle-shaped, mostly pedicdkd, in drooping panicles ; achenium oblony, 

 half the length of the slender bristles, twice the length of the triangular-sub- 

 ulate tubercle. Low grounds, Virginia and southward. 



* * Achenium smooth and even, lenticular. 

 *- Bristles of die perianth denticulate or barbed upwards. 



4. R. fiisca, Koem. Schultes. Leaves bristle-form, channelled; spikes 

 ovate-oblong, few, clustered in 1-3 loose heads (dark chestnut-color) ; achenium 

 obovate, half the lenyth of the bristles, about the length of the triangular-sword- 

 shaped acute tubercle, which is rough-serrulate on the margins. Low grounds, 

 New Jersey to New Hampshire : rare. July. Culm 6'- 12' high. (Eu.) 



5. R. gracili'lita, Gray. Leaves narrowli/ linear; spikes ovoid, in 2 - 4 

 small clusters, the lateral long-peduncled ; achenium ovoid, rather sliorter tJtan the 

 Iristles, about the length of the flattened awl-shaped tubercle. Low grounds, 

 S. New York, New Jersey, and southward. Culm very slender, l-2 high. 



*- - Bristles denticulate or barbed downwards (in No. 9 botJi ways). 



6. R. alba* Vahl. Leaves almost bristle-form ; spikes (whitish) several in a 

 corymbed cluster, lanceolate ; achenium ovoid, narrowed at the base, shorter than the 

 9-11 bristles, a little longer than the slender beak-like tubercle ; stamens usually 

 only 2. Bogs; common Eastward (both north and south) and northward. 

 Culm slender, 12' -20' high. (Eu.) 



7. R. capill Ticca, Ton-. Leaves bristle-form; spikes 3-6 in a terminal 

 cluster, and commonly 1 or 2 on a remote axillary peduncle, oblong-lanceolate (pale 

 chestnut-color, J' long) ; achenium ol)long-ovoid, stipitate, very obscurely wrinkled, 

 aboi.t half the length of the 6 stout bristles, and twice the length of the lanceolate- 

 beaked tubercle. Bogs and rocky river-banks, Pennsylvania to New York and 

 Michigan. Culm 6' -9' high, slender. 



8. R. Kllieskcrilii, Carey. Leaves narrowli/ linear, short; spikes nu- 

 merous, crowded in 4 -6 distant clusters, oblong-ovate (chestnut-color, scarcely 1" 

 long) ; achenium obovate, narrowed at the base, equalling the 6 bristles, twice the 

 length of the triangular flattened tubercle. Pine barrens of New Jersey, on 

 bog iron-ore banks exclusively (Kjiieskern), and southward; rare. Culms 

 tufted, 6' -18' high, slender. 



9. R. glomei'ata, Vahl. Leaves linear, flat ; spikes numerous in distant 

 clusters or Jieads (which are often in pairs from the same sheath), ovoid-oblong 

 (chestnut-brown) ; achenium obovate, margined, narrowed at the base, as long 

 as the lance-awl-shaped flattened tubercle, which equals the (always) downwardly 

 barbed bristles. Low grounds, Maine to Kentucky, and southward. Cuba 

 l-2 high. A state with small panieled clusters is R. pauiculata, Gray. 



