48 CYPERACEAE 



Low wet woods from Sibley to Atherton. Locally abundant. May- 

 September. 



3. C. monile Tuckerm. Culms 2° -3° high : leaves 1J"-2J" wide : 

 staminate spikes 2-4: pistillate 1-3, l''-2'' long, narrowly cylindrio, 

 many-flowered ; perigynia somewhat inflated, 2^" long, strongly-nerved. 

 Abundant near Lake City and Sibley. May-June. 



4. C. lurida Wahl. lJ°-3° high : leaves long and rough : pistillate 

 spikes 2-4, densely flowered, erect, spreading or drooping, sessile or short- 

 stalked, 9^-24''' long : perigynia 10-nerved, inflated, slender-beaked, i." 

 long, the teeth V'-'i," long : staminate spike solitary. — Very common in 

 bogs along the blufEs west of Sibley. June- July. 



Var. ezundans Bailey. Pistillate spikes all long-stalked. — Occasionally 

 occurs with the type. 



5. C. hystricina Muhl. Like the last, but pistillate spikes shorter 

 (J'-IJ' long), the lower slender-stalked and drooping : perigynia Y'-'i," 

 long, little-inflated, 15-20-nerved, the beak strongly toothed. — With the 

 last, but matures from May-June before C lurida is noticeable. 



6. C. Frankii Kunth. l°-2° high, with long rough leaves and similar 

 bracts, much longer than the culm : pistillate spikes 3-5, very dense, 

 Y-IY long. 4" in diameter : perigynia abruptly contracted and depressed 

 at the summit, from the center of which depression arises the slender beak. 

 —Common in wet grounds throughout. June-September. 



7. C. tjrphinoides Sohwein. 2°-3° high : leaves 2"-3" wide : spikes 

 1-3, oblong, densely flowered, J'-IJ' long, 6" in diameter, the terminal 

 staminate at base ; perigynia obovoid, widely spreading or ascending, 

 beaked, twice the length of the inconspicuous scale. Bogs west of Sibley. 

 Not common. May- June. 



8. C. trichocaipa Muhl. l°-4° high, stout : leaves and bract exceed- 

 ing the culms : staminate spikes 2-6 : pistillate spikes 2-5, cylindrio, 

 l'-4' long ; perigynia long-conic, 4'''-5" long, many-nerved, tapering 

 into a stout 2-toothed beak, smooth : scale hyaline, shorter than perigynia. 

 Our form is var. iniherbis Gray. — Low swales in the Missouri River bot- 

 toms. Not common. May-June. 



9. C. aristata R. Br. Resembles the last, hut sheaths pubescent : spikes 

 sometimes 5' long : perigynia slender : scales terminating in an awn of 

 their own length. — Abundant around Fish Lake near Sibley. May-June. 



10. C. ripaiia. Curtis. Culms 2°-4° high: leaves rough, long and 

 broad : staminate spikes several : pistillate spikes 2-4, lY-i' long, usually 

 erect, loosely flowered below : perigynia ovate-lanceolate, not inflated, 

 few-nerved, coriaceous : scale exceeded by perigynia. — Low swales and 

 swamps, especially along the Missouri River. Common. May-June. 



11. C. lanuginosa Michx. Culms 2° -3° high, rough above : leaves 

 l"-2" wide : staminate spikes 1-3 : pistillate spikes 2-3, rather distant, 

 l'-2' long, densely flowered : perigynia hairy, ribbed, 1" in diameter. 



