carex CYPERACE^ 695 



lar: tubercle triangular-subulate, flat, % as long as the achene. In bogs, 

 Oregon to Alaska, Newfoundland and Florida. 



9 CAREX L. Sp. 972. 



Perennial herbs with triangular stems, linear 2-ranked leaves 

 and monoecious, dioecious or androgynous flowers borne in termin- 

 al solitary or racemed spikes, each usually subtended by a leaf- 

 like bract. Perianth none or rarely represented by a single bristle. 

 Staminate flowers of 3 stamens with filiform filaments, usually 

 all in the terminal spike. Pistillate flowers of a single pistil 

 with a style and 2 or 3 stigmas, borne on a very short axis in the 

 axil of a sac-like bractlet or second bractlet called the perigynium 

 which completely encloses the 3-angled, lenticular or plano- 

 convex achene. 



Subgenus i Eucarex Cosson Fl. Paris, 744. Staminate 

 flowers in one or more terminal spikes, sometimes w r ith pistillate 

 flowers at the base or apex. Pistillate flowers in distinct and 

 simple mostly peduncled spikes. Cross-section of the perigynium 

 circular, obtusely angled or prominently trigonous in outline. 

 Style mostly 3-parted and the achene triangular or triquetrous. 



Tribe i Physocarp^: Drejer Symb. Car. 10. Spikes few to 

 many, distinct, densely flowered. Perigynium mostly straw-color 

 at maturity, papery in texture, more or less inflated, smooth, 

 nerved, tapering into a beak as long or longer than the body. 

 Stigmas mostly 3. 



• § 1 Pauciflor^e Tuckerman Enum, Meth. 7. Spike andro- 

 gynous, the pistillate flowers at the base, few. Perigynium green- 

 ish, linear-lanceolate, several times longer than the scale. 



C. pauciflora Lightf. Fl. Scot. 545, t. 6. Glabrous: stems erect or 

 assurgent, very slender, 4 inches to 2 feet high : leaves very narrow, shorter 

 than the stem, the lowest reduced to toothed sheaths : scales inconspicuous, 

 lanceolate to ovate, deciduous: perigynium scarcely inflated, 3-4 lines 

 long, about %. line in diameter, tapering from below the middle into a 

 slender or almost subulate beak, strongly reflexed : stigmas 3. In bogs, 

 Washington to Alaska, Newfoundland and Pennsylvania. 



§ 2 VESiCARiiE Tuckerman 1. c. 13. Staminate spikes com- 

 monly 2 or more. Pistillate spikes usually long-cylindrical and 

 dense. Perigynium smooth and shining, much inflated, at ma- 

 turity straw-color or sometimes purple, beaked and conspicuously 

 2-toothed, usually prominently few-nerved. Stigmas 3. 



C. utricnlata Boott Hook. Fl. ii, 221. Glabrous: stems stout, erect, 

 2-4 feet high : leaves elongated, the upper mostly exceeding the stem, 2-6 

 lines wide, the midrib prominent : bracts leaf-like: staminate spikes 2-4, 

 linear, peduncled, the lower sometimes pistillate at the top: pistillate 

 spikes 2-4, densely many-flowered, or sometimes looser near the base, 2-6 

 inches long, the lower short-peduncled, the upper sessile or nearly so, 

 sometimes staminate at the summit: scales lanceolate, the lower awned 

 and slightly longer than the perigynium, the upper acute: perigynium 

 ovoid, light green, 2-3 lines long, narrowed above to a sharp 2-toothed 



