Carex Cyperaceae 257 



Between C. viridula and f . intermedia there is a more or less well-defined 

 seasonal difference in flowering and maturing of the fruit as may be seen 

 from the collection dates with Maps 524 and 525. In Indiana C. viridula 

 is in its prime in June ; f . intermedia in August. 



N. Y. to Wis., southw. to N. J. and Ind. 



99. Carex cryptolepis Mack. {Carex flava var. rectirostra Gaudin, in 

 part.) Map 526. Frequent in northern Indiana on marly lake borders 

 and in marshes rich in marl ; infrequent on wet sandy lake shores. 



Newf. to Minn., southw. to N. J. and Ind. 



100. Carex flava L. Map 527. A widespread species which is common 

 throughout most of its range but rare and very local in Indiana. The two 

 known localities for it in the state are : marly marsh on the Wolverton 

 Estate, 7 miles southwest of South Bend, St. Joseph County, Deam nos. 

 54874 and 55079 ; and springy wooded bank of Flat Rock River, three- 

 fourths of a mile above St. Paul, Decatur County, Mrs. C. C. Deam nos. 

 10766 and 13400. 



Newf. to B. C, southw. to N. J., Ind., and Mont.; also in Europe. 



29. § VIRESCENTES 



Perigynia densely pubescent; spikes about 3-4 mm thick, the lower more or less widely 

 separated and peduncled; ligule much longer than wide. 

 Pistillate spikes oblong or oblong-globose, abrupt or rounded at the base, the lowest 

 5-20 mm long; perigynia broadly obovoid; anthers 0.8-1.6 mm long; leaves 



usually exceeding the culms 101. C. Swanii. 



Pistillate spikes linear, attenuate at the base, the lowest 15-40 mm long; perigynia 

 oblong-elliptic or narrowly obovoid; anthers 1.5-2.5 mm long; leaves usually 



shorter than the culms 102. C. virescens. 



Perigynia glabrous; spikes 4-8 mm thick, contiguous or nearly so, sessile or subsessile; 

 ligule not longer than wide. 

 Perigynia strongly flattened ventrally, rounded at the apex, nerved, achenes with a 



somewhat bent short-apiculate tip 103. C. hirsutella. 



Perigynia turgid, nearly round in cross section, short-pointed at the apex, coarsely 

 nerved or ribbed; achenes with a very abruptly bent apiculate tip or style. 

 Leaf blades glabrate; perigynia 2 mm long; pistillate scales not pilose, obtuse or 



short-cuspidate 104. C. caroliniana. 



Leaf blades pubescent, especially below; perigynia 2.5-3.5 mm long; pistillate scales 

 sparingly pilose, long-acuminate, cuspidate or awned 105. C. Bushii. 



101. Carex Swanii (Fern.) Mack. (Carex virescens var. Swanii Fern.) 

 Map 528. Common in clearings in low woods, and in moist open oak 

 woods ; infrequent along roadsides, on flood plains, and on wooded slopes. 



N. S. to Wis., southw. to N. C, Tenn., and Ark. 



102. Carex virescens Muhl. Map 529. Fairly common in the southern 

 counties, especially in the knob area (Chestnut Oak Upland), on wooded 

 bluffs, slopes, and river banks; infrequent in level woods. It is known 

 from the lake area from a single collection and most reports from the 

 northern third of the state were doubtless based upon material of 

 C. Swanii. 



Maine to Ind., southw. to Ga. and Tenn. 



