254 



('YPERACEAE 



Carex 



~33 

 Map 519 



Carex prasina Wahl. 



50 



Map 520 



Carex Davisii Schwein. & Torr. 



94. Carex prasina Wahl. Map 519. Infrequent, becoming frequent in 

 the southeastern counties. A species of very wet or springy habitats in 

 deep woods, growing generally along streamlets and frequently on bars 

 and rocks in streams. 



Que. to Mich., southw. to D. C. and Ky., and in the Alleghenies to Ga. 



95. Carex Davisii Schwein. & Torr. Map 520. Frequent in neutral or 

 calcareous soils in low, especially alluvial, beech and beech-maple woods 

 and in moist roadside ditches. It sometimes superficially resembles luxu- 

 riant forms of Carex grisea from which it may be readily distinguished by 

 the terminal spike which is gynaecandrous in C. Davisii and staminate in 

 C. grisea. 



Vt. to Minn., southw. to Md., Term., and Tex. 



26. § SYLVATICAE 



Perigynia sessile or substipitate; scales obtuse to short acuminate, usually half the 

 length of the perigynia or less; achenes conspicuously stipitate; broadest basal 

 leaves 2-4.5 mm wide. 

 Perigynia G-10 mm long, narrowly lanceolate, broadest below the middle, very gradu- 

 ally tapering toward the apex or the broad portion elongate; pistillate scales 



mostly rounded on the back, rarely tinged with reddish brown 96. C. debilis. 



Perigynia 4.5-7 mm long, broadly ovate-lanceolate, broadest at the middle, abruptly 

 tapering at both ends, the broad portion short; pistillate scales mostly keeled 



and tinged with reddish brown 96a. C. debilis var. Rudgei. 



Perigynia strongly stipitate; scales strongly cuspidate or awned, usually more than 

 half the length of the perigynia; achenes substipitate or sessile; broadest basal 

 leaves 5-10 mm wide. ( See excluded species no. 21, p. 275.) C. arctata. 



96. Carex debilis Michx. Map 521. Infrequent in southern Indiana, 

 principally in the southeastern counties, where it is found in low wet 

 woods, especially flat or even swampy pin oak and beech-sweet gum woods. 



