CYPERACE.E. (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. To r re y fan a, Gray. Ctdm nearly terete, slender ; leaves bristle-form ; 

 cynics panided, somewhat loose, the spikes mostly pedicefled; uchemitut ol>iony-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. iliexpaiisa, Vahl. Culm triangular, slender; leaves narrowly lin- 

 ear; spikes spindle-shaped, mostly pedicelled, in drooping panicles ; acht nium obioiHj, 

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

 ulate tubercle. Low grounds, Virginia and southward. 



* * Athenium smooth and even, lenticular. 

 )- Bristles of the perianth denticulate or barbed upwards. 



4. R. fYfiSCa, Roem. & Schultes. Leaves bristle-form, channelled ; spikes 

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

 obovat?, half the length 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. grtcileilta, Gray. Leaves narrowly linear; spikes ovoid, in 2-4 

 small clusters, the lateral long-peduncled ; achenium ovoid, rather shorter than 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 both ways). 



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

 corymhed duster, lanceolate ; achenium ovoid, narrowed at the base, s/torter 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. capillfkcea, Torr. Leaves bristle-form; spikes 3-6 in a terminal 

 clutter, and commonly 1 or 2 on a remote axillary peduncle, obi oiuj -lanceolate, (pale 

 chestnut-color, ' long) ; achenium obl-ona-ocoid, 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 s:j?d 

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



8. R. KaiiesKerilii, Carey. Leaves narrowly linear, short ; spike-s nu- 

 merous, crouxled in 4 -6 distant clusters, oblona-ovate (chestnut-color, scarcely 1" 

 lorg) ; 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 (Knieskern), and southward; rare. Culms 

 tufted, 6' -18' high, slender. 



9. R. glomcrata, Vahl. Leaves linear, flat ; spikes numerous in distant 

 clusters or heads (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. Culm 

 l-2 high. A state with small panioled clusters is R. paniculata, Gray. 



