532 MACKENZIE: NOTES ON CAREX 
The main distinctions between those members of the Montanae 
which are here discussed and which differ from all the other 
members of the group in having the pistillate spikes or some of them 
on short culms or on basal peduncles and so hidden among the 
leaves, — be vianges eget as follows: 
5 ae i ly many trongl sees 
Kalen putblihstioned, eae to cuspidate; perigyni 
body globose; staminate spikes many-flowered; ae 
pistillate spikes on elongated, very slender peduncles. 1. C. globosa. 
Scales reddish-brown tinged, cuspidate or long-awned; 
enn ium body oval; staminate spikes few-flowered; 
basal pistillate spikes on short erect peduncles. 2. C. Brainerdii. 
II. Perigynia strongly 2-keeled, otherwise nerveless (except 
t times obscurely coarsely nerved at bas @). 
A. secre and staminate spikes closely contiguous (the 
ms often very short). 
Pera normally triangular; scales strongly dark- 
Pig aay stolons short, ascending; culms strongly 
fibrillose 
Achenes meals nie ate abe sept 3 at eet one 
a tely dark 
little fibrillose at base. 
B. Lower pistillate spikes widely separate (on subradical 
peduncles). 
3. C. nigro-marginata. 
4. C. floridana. 
Bract of sowent non-basal pistillate spike leaflet-like, 
exceeding culm; if at all colored, purplish-brown 
siiad at base. 
Rootstock slender; culms Saga loosely ces- 
pitose (perigynia 2.5 mm. long, short-beaked, 
shallowly bidentate; staminate spike 2. o mm. 
long, inconspicuous); northeastern species. . C. deflexa. 
Roots nas stout; culms de nsely satis 
species. 
vines acre spikes normally several- to 
y-flowered; perigynium beak biden- 
: ae the margins ciliate-serrulate. 
Perigynia 2.5-3 mm. long, the beak 0.25— 
0.75 mm. long, pete bidentate. 6. C. brevipes. 
sietensi? Sie 5 mm. long, the beak longer, 
biden q. -C. Rosstt. 
Upper sacs spikes 1-3-flowered; _peri- 
gynium beak obliquely cut, in age biden- 
tulate; the margins little if at all ciliate- 
serrulate (New Mexico). 8. C. pityophila. 
Bract : lowest non-basal A — if pres- 
, squamifor er than culm; or, 
Mi lone. srt aise paket reddish-brown 
tinged a 
