North Ainciican Ci/jjemcctT. 349 
Hab» Sandy banks of rivers, Massachusetts to Pennsyl- 
vania, and west to Kentucky. Deerfield, Massachusetts, 
Prof. Hitchcock and Dr. Coolcy! ; banks of the Connecticut, 
near Middletown and elsewhere ! ; Nordiern parts of the State 
of New York, Dr. M. Stevenson ! ; western parts of the same 
State, Dr. Gray!; Lexington, Kentucky, Dr. Short! 
Oes. Nearly related to /. sctacea of R. Brown and iV". ab 
Esenb. and /. scfiarrosa, Roem. ^ Schult., (Scirpus squarrosus), 
but is distinguished from both by its bifid (not 3-cleft) style, as 
well as by other characters. It has much the habit and cha- 
racters o( Liixjcarjiha viacidata, except that it wants the inte- 
rior scales, and Vahl long ago made a similar remark of his 
Scirpus scpiarroszis,* noAv referred to Isolepis ; and Nees ab 
Esenbeck seems to think that it may be a Lipocarpha with the 
interior scales abortive. According to Vahl, the S. squarrosus 
has the style 2-cleft, but N. ab Esenb. states distinctly that it is 
3-cleft. 
2. Isolepis carinata, Hool-. ^^ Am. 
Culm somewhat compressed, sulcate, setaceous, with a 
single leaf near the base ; spike ovate, solitary, growing from 
the side of the culm near the summit, without an involucre, 
few (6 — S)-flowered; scales boat-shaped, carinate, abruptly 
acuminate ; style 3-cleft ; nut short, acutely triangular, rough- 
ened with papillae. 
I. carinata, Hook. S^' Am. Mss.l 
Culms cespitose, 3 — 4 inches high, smooth. Leaves setaceous, chan- 
nelled, half the length of the culm, sheathed at the base. Spike rather 
obtuse, few-flowered, situated about half an inch below the summit of 
the culm. Scales remarkably concave and gibbous, with several curs'ed 
narrow wrinkles on each side towards the keel. Stamens 2 1 Style short, 
* " Facies Hyp^ltpti, sed deficiunt corolla et tubercula." Vahlf 
enum. 2. p. 259. Vahl, whose Hypaclyptum included the modern 
Lipocarpha, was incorrect, however, in stating that the nut, in his genus, 
is furnished with a tubercle. 
