192 BEW YOEK STATE MUSEUM 



Pistillate spikes l'-2' long, aclienia without prominent 



I mammillate angles lupulina. 



Pistillate spikes 2'-S' long, achenia distinctly mammil- 

 late on the angles lupuliformis. 



115. Carex lupulina 3fuhl. 



Stoloniferous ; stems 2°-3'' high, erect, robust, acutely angled, 

 smooth ; leaves 3"-6" broad or more, smooth, rough-mar- 

 gined, conspicuously nodose, reticulated on the upper surface, 

 much surpassing the culm ; staminate spike single (rarely 

 two), cylindrical, l'-3' in length on a peduncle i'-li' long; 

 pistillate spikes 2-6, closely Hoovered, l'-2' long, 8"-10" broad, 

 the upper ones approximate, short-stalked or sessQe, the others 

 some u'hat scattered and longer peduncled,or sometimes all sessile 

 or nearly so, the lowest usually on a stalk i'-l^' long ; bracts 

 leaf like, prominently sheathing, muah surpassing the culm ; peri- 

 gynisi ovate-lanceolate, conspicuousl}'- stipitate, prominently 

 nerved, thin, 6' -9" long, erect-spreading, gradually tapering into 

 a long biientate beak, nearly twice the length of the lanceolate, 

 awnpointed scale; achenium triquetrous, sharply angled, stipitate, 

 about 1^" long, scarcely 1" broad, tapering each way from the 

 middle, the apex continuous with the persistent tortuous base of 

 the style. 



Swamps and water holes. Common. July. 



Tar. pedunculata Deiv. Differs in its more scattered promi- 

 nently ped uncled spikes, its usually long-stalked sterile spike and 

 the more divergent perigjmia. 



C. lupulina x retrorsa Dudley. Perigynia straw-colored, hori- 

 zontally spreading ; scale acute or short-awaed. 



116. Carex lupuliformis Sartioell. 

 Stems 2°-3° high, stout, smooth, usually stoloniferous ; leaves 

 longer than the culm, 3"-G'' wide, smooth, rough-margined ; 

 staminate spike clavate, 1^-3' long, often long-stalked; pistillate 

 spikes 2-5, mostly 4, cylindrical, closely flowered, the upper 3 

 contiguous, sessile, the others short peduncled, the lowest distant 

 or remote on an exserted stalk ^'-1' in length, all erect and stiff, 

 2-3' long, 9"-12" broad or more ; bracts foliaceous, sheathing, 

 far surpassing the culm ; perigynia ovate-acuminate, 5"-9" long, 

 much inflated, strongly nerved, thin, more or less spreading, 



