428 North American Cyperacea. 
The genus Uncinia differs from Carex only in having a 
hypogynous seta within the perigyniimi. The nature of this 
body seems to be exphuned by the structure of Schoeno- 
xyphium, A', ab E. (and the same thing we observe in a single 
specimen of Carex pliijUostaclnjs, Meyer) in wdiich the peri- 
gynium includes the peduncle of a staminate spikelet as well 
as the nut ; and moreover, in U. Nepalensis, N. ab E. in 
Wight's contrib. p. 129, the seta is said to bear on its summit 
an imperfect rudiment of a flower or spikelet. 
Uncinia breviseta. 
Spike solitary, simple, attenuate above ; scales of the pis- 
tillate flowers suborbicular, scarious, amplexicaul, a little 
shorter than the fruit ; nut ovate, obtusely 3 — (or 4 — ) angled, 
apiculate ; seta straight, smooth, flattened, mostly shorter than 
the nut. 
Carex filifolia, it. Brown ! in Rich, a pp. Frankl. journ. ed. 2. p. 35 ; 
Schw. 4- Torr. ! car. L c. p. 298, not of Nutt. 
Kobresia globularis, Dewey ! car. I. c. 29, p. 253. 
Cespitose. Culm 6 — 10 inches high, smooth, slender, clotlied at the 
base with numerous brown sheaths. Leaves setaceous, slightly scabrous, 
nearly as long as the culm. Sjnke about an inch long, pistillifei-ous, 
and rather loosely flowered below, staminiferous, attenuate, and densely 
flowered above. Scales of the pistillate flowers 6 — 8, ovate-orbicular 
scarious and silvery, ferruginous in the centre. Pcrigynium minutely 
puberulent. scarious, white and somewhat mottled with ferruginous ; 
orifice entire or slightly lacerate. Nut completely filling the pcrigy- 
nium, obtusely tri, or quadrigonous, glabrous, with a short abrupt acu- 
mination. Style 3-parted. Seta included or exserted {?[de Brown), in 
our specimens shorter than the nut. 
Hab. In the woody country of Arctic America, Dr. Rich- 
ardson ; also near Carlton House ! 
