350 ENDOGENOUS PLANTS 



THREE-HEADED CAREX. 



Culms 12 to 18 inches high, leafy. Leaves about as long as the culm, the upper 

 one often overtopping it, mostly hairy ; sheaths thickly clothed with strigose 

 pubescence, the lower ones purple. Spikelets % to % of an inch long, the lower 

 ones on short peduncles, and each with a lance-linear foliaceous bract at base. 

 Hob. Moist meadows, and borders of woods: frequent. jPZ. May. Fr. July. 



g 4. Perigynia not inflated, smooth ; staminate spikelet solitary, pedunculate, 

 t Pistillate spikelets all on filiform exserted peduncles. 



23. C. platypliyria, Carey. Pistillate spikelets 3, loosely 3- 

 or 4-flowered ; perigynia small, longer than the oval acute scale. 

 C. oligocarpa, var. latifolia. A. Gr. $ Fl. Cestr. ed. 2. p. 38. 

 BROAD-LEAVED CAREX. 



Culms 9 to 18 inches long, very slender, and naked above. Leaves pale whitish 

 or glaucous green, about half an inch wide, and 6 to 12 inches in length. Stam. 

 spikelet % of an inch long. Pistillate spikelets about % an inch in length, the lower 

 one on a long peduncle ; bracts green, the upper one about equalling the spikelets, 

 the lower rather exceeding them. 

 Hob. Hilly woodlands: frequent. FL May. Fr. July. 



24. C. cliffitiilis, Willd. Pistillate spikelets about 3, loosely 5- 

 to 9-flowered, the lower ones on long peduncles ; perigynia tri- 

 quetrous, striate, longer than the ovate acute scale. 



C. oligocarpa. Schw. $ Torr. $ FL Cestr. ed. p. 37. not of Schkuhr. 

 FINGER-LENGTH CAREX. 



Culms 6 to 12 inches long, slender, somewhat decumbent, leafy. Leaves thin, 

 narrow, dark green, upper ones (or bracts) surpassing the culm, the lower ones 

 abbreviated. Stam. spikelets % an inch to % in length, from the same sheath 

 with the upper pistillate one. Pistillate spikeUts %to%of an inch long, the 

 lowest often on a subradical peduncle ; bracts long, sheathing, resembling leaves. 

 Hub. Hilly woodlands : frequent. Fl. May. Fr. July. 



fj- Upper pistillate spikelet on an included peduncle. 



25. C. anceps, Willd. Pistillate spikelets 2 or 3, distant, loosely 

 flowered, with a flexuose rachis; perigynia ovoid, rather longer 

 than the ovate cuspidate scale. 



TWO-EDGED CAREX. 



Culms 9 to 18 inches high, acutely triangular with the sides of unequal width, 

 sometimes nearly ancipital above, leafy. Leaves variable, radical ones lance- 

 olate, 4 to 9 or 12 inches long, and some of them nearly an inch wide, glaucous, 

 living through the winter ; those on the culm much narrower, with thin white 

 sheatfis. Stam. spikelets % an inch to % in length, with a compressed peduncle, 

 from the same sheath with the upper pistillate one. Pistillate spikelets 2 to 5, 

 usually 2, % of an inch to an inch long, the upper one nearly sessile, the others 

 on ancipital peduncles, supported by the sheaths of leaf-like bracts. 

 Hob. Hilly rich woodlands : frequent. Fl. April. Fr. July. 



b. Perigynia with a distinct beak. 



g5. Perigynia not inflated, hairy ; staminate spikelet solitary ; bracts short ; leaves 

 all radical. 



26. C. Pennsylvanlca, Lam. Staminate spikelet usually 

 pedunculate; pistillate spikelets 1 to 3, mostly 2, approximated, 



