PLANTS OF SOUTHERN NEW JERSEY. 285 



CAREX L. 



The g-enus Carex is represented by but few species in the Pine 

 Barrens, but in other parts of our region a number of species 

 occur. Some of northern affinities barely enter our hmits, while 

 others are widespread. 



Flowering and Fruiting Data. — Time of year noted indicates 

 the season during which characteristic, fully developed perigynia, 

 generally with mature achenes, are present, and intact spikes 

 occur — satisfactory study of the genus can only be undertaken 

 at this season. 



Key to the Species. 



a. Staminate and pistillate spikes clearly distinct, although they may be closely 

 contiguous. 



b. Staminate spike long-stalked, so that it stands entirely clear of the 

 adjacent pistillat spike even when the latter is appressed to the stalk. 

 c. Staminate spike single. 



d. Pistillate spikes large, at least 12 mm. in diameter. 



e. Sessile and nearly globular, several close together, green. 



C. intumescems, p. 291 

 ee. Peduncled, cylindrical, 25 mm. or more long, lowest spike 

 often drooping on a very slender peduncle. 



C. hystericina, p. 293 

 dd. Pistillate spikes medium, 8 mm. in diameter, plant glaucous. 



C. livida, p. 303 

 ddd. Pistillate spikes, small, less than 6 mm. in diameter. 



e. Tall, upright flower stalks nearly or quite equaling the leaves 

 or exceeding them. 



/. Leaves broad, many of them, 6 mm. broad or more, glau- 

 cous, lower pistillate spikes on long flexuous peduncles six 

 times their length. 



C. laxiculniis, p. 302 

 ff. Leaves narrow, 4 mm. broad or less. 



g. Beak of perigynia elongated and twisted to one side, 

 lower pistillate spikes on long flexuous peduncles. 



C. styloHexa, p. 302 

 gg. Beak not produced or twisted, very short. 



}i. Staminate spike with peduncle, 75-100 long. 



C. tetanica, p. 301 

 lih. Staminate spike with peduncle, 25-50 mm. long or 

 less. 



i. Pistillate spikes, 3 mm. in diameter, lowest on 

 filiform peduncles, achenes sharply 3-angeled. 



C. digitalis, p. 302 

 a. Pistillate spikes, 5 mm. in diameter, none slender 

 pedtmcles, achenes not sharply 3-angeled. 



C. conoidea, p. 301 



