94 KEPOET OF THE STATE BOTANIST. 



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



mammillate angles lupulina. 



Pistillate spikes 2'-3' long, achenia distinctly mammil- 

 late on the angles lupuliformis. 



115. Carex lupulina MiM. 



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'-l^' long; 

 pistillate spikes 2-fi, closely flowered, i'-2' long, 8"-10" broad, 

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

 somewhat scattered and longer peduncled, or sometimes all sessile 

 or nearly so, the lowest usually on a stalk \'-lV long; bracts 

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

 gynia ovate-lanceolate, conspicuously stipitate, prominently 

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

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

 awn-pointed 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. 



Var. pedunculata Dew. Differs in its more scattered promi- 

 nently peduncled spikes, its usually long-stalked sterile spike and 

 the more divergent perigynia. 



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

 zontally spreading ; scale acute or short-awned. 



116. Carex lupuliformis Sartwell. 

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

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

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

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

 contiguous, sessile, the others shortpeduncled, the lowest distant 

 or remote on an exserted stalk \'-l' 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 



