FERNALD. — CARICES OF SECTION HYPARRHENAE, 461 
++ Bracts wanting or setaceous, if broad at most twice as long as the spike. 
= Plant oe RN culms rising from an — root- 
st um firn o 6 mm. long (4) C, siccata. 
= Plant not cele tolonifeoa culms iP or in stools. 
a. Perigynia soa bro. : 
1. Peri a 5 mm. or more lon 
O Petey 7 to 10 mm. lon: spikelets sui haere pointed, 
o02.5cm.long . (1) C. muskingumensis. 
00 Pega shorter (or, when sdiceianletaits 7 mm. long, in 
horter spikelets). 
+ Pde half as broad as long, Mid nerveless or gicrore! 
short-nerved on the inner face (21) C. aenea. 
++ Perigynia one-third as broad as long. 
X Perigynia thin and scale-like, ected distended over the 
achenes, distinctly nerved on the inner face, and promi- 
meniea exceeding the subtending stale 
§ Leaves at most 3 mm. wide: spikelets 3 to 9, glossy 
ico wn or straw-colored, pointe 
Spike ee as or stein, with ascending 
2 
approximate spike ) C. scoparia. 
Spike moniliform . . (2) ©. scoparia, var. moniliformis. 
= short-globose or fee ovoid, the spikelets 
wded and divergen 
(2) C. scoparia, var. condensa. 
§ § Leaves more than 3 mm. wide: sani 8 to 14, er 
or dull brown, blunt . . . . (8) ¢. ibaloides 
‘(For vars. see below 
xX & Perigynia firm, eninge’ distended over the achenes, 
nerveless or obscurely nerved on the inner faces, 
equalled by oa eed scales. . . . (7) C. praticola. 
2. Perigynia less than 5 mm. lon 
O Perigynia thin and seal searcely distended over the 
road. 
Spike oblong, the spikelets riiah wre . (38) C. tribuloides. 
Spike moniliform, the spikelets scattere 
(8) C. "aihdhdibe var. turbata. 
++ Perigynia with spreading tips: spike flexuous 
(3) ¢. — var. reducta. 
OO Perigynia firm, obviously distended over the achen 
+ Perigynia ge aig or subulate, less shea one-third 
road as long, at most 1.4 mm. broad. 
X Tips of perigynia cabana exceeding the lance- 
subulate dull scales. 
to 4 dm. high: leaves 1 to 2.5 mm. wid 
spikelets 3to 7 mm.long . . © Cc. Cramfordit. 
