C. Dewey on Caricography. 253 
Common over the United States, and the plant usually desig- 
nated by this name, with which C. marginata, Muhl. and Sehk., 
has been confounded. 
- marginata, named and described by Muhl. in his Gram., 
and sent by him to Schk., who described and figured it in his 
Reidg., Part 2, p. 49, fig. 143, is a short plant, 4-8 inches high, 
(a span high, Muhl.) stocky, with leaves erect and longer than the 
culm even before the fruit matures; spikes few-fruited and ses- 
sile, with fruit distinctly globose and short rostrate and sub-stiped ; 
ile C. Pennsylvanica is about twice as tall, 8—15 inches, slen- 
der, with short leaves till late in the season; spikes with more 
fruit, and the fruit oblong or long-oval, plainly triquetrous. 
_ Both appear easily distinguishable from C. varia, and other spe- 
cies of the same family. 
No. 248. C. Persoonii, Sieb. Herb., H. Aust., No. 282, secundum 
ang in Linnea, vol. vill, p. 539. 
— vitilis, Fries, Nov. Mant., iii, p. L387 et Summa Veg. 
Scand., p. 223. 
— canescens, I.., var. alpicola, Wahl. 
— canescens, L., var. brunnescens, Koch. 
— - - = var. spherostachya, Tuck. Enum. 
— spherostachya, Dew., Sill. Journ., vol. xlix, p, 44, 
er. prima. 
— gracilis? Schk., Part 1, p. 48. 
_Spiculis 3-5, ovatis, approximatis in apicem vel infra subremo- 
tis, alternis, sessilibus, paucifloris, bracteatis, inferne staminiferis ; 
Tuctibus distigmaticis, ovatis, submarginatis, substriatis, oblongo- 
lanceolatis vel tereto-rostratis, convexo-planis, glabris cum rostro 
fisso, squama ovata hyalina longioribus ; eulmis sub- 
orsunr 
prostratis, vitilinsculis ; foliis planis margine scabris. 
them is the split on the back of the beak, which in the abundant 
Specimens of our country is a character after, not always, clearly 
