76 PROCEEDINGS OP THE AMERICAN ACADEMY 



3 or 4, the terminal club-shaped and staminate, an inch or so long, the 

 others pistillate, an inch or less long, sessile : perigynium lance-ovate, 

 rather obscurely nerved, smooth, the spreading teeth conspicuously his- 

 pid, mostly longer than the ovate and awned brown scale. — Found by 

 Wm. Boott in Herb. Olney, without date, collector, or locality, but 

 ticketed "California." 



48. Carex riparia, W. Curtis, Fl. Lend. iv. t. 60. 



G. lacustris, Willd. Sp. PI. iv. 306. 

 Throughout the States east of the Mississippi and in Louisiana ; 

 Pend d'Oreille Kiver, N. Idaho, Lyall ; Arctic America, Herb, 

 Europe. 



49. Carex acutifonnis, Ehrhart, Calam. Exs. no. 30. 



G. paludosa, Gooden. Liun. Trans, ii. 202. 

 Thoroughly established at Dorchester, Mass. ; boggy meadow, New 

 Bedford, Mass., Willey. 



Section III. MICRORHYNCH^, Drejer, Symb. Car. 9. (In- 

 cluding JErostachyce and Melananth(B, Drejer, 1. c.) Parallel with the 

 last section : distinguished in general by the much smaller and nearly 

 or entirely beakless and mostly entire-mouthed perigynium which is 

 much thinner in texture : stigmas two or three. — Paludose and alpine 

 species of various habit, mostly possessing colored spikes, often grow- 

 ing in dense tufts or tussocks. This is the most critical section of the 

 genus. It is largely represented in Europe and North America. 



A. AtratoR, Kunth, Enum. PI. ii. 431. Terminal spike club-shaped and andro- 

 gynous with the staminate flowers below ; pistillate spikes mostly short and 

 dark-colored, either erect or drooping ; plants mostly alpine or boreal. — The 

 members differ widely in habit, the spikes of C. Mertensii and C. atrata, var. 

 ovata, being mostly light-colored or parti-colored and drooping, while those 

 of the others are black or nearly so, and more or less erect, although some 

 black-spiked forms of C. atrata have drooping spikes. 



50. Carex alpina, Swartz, Lilj. Svensk. Fl. ed. ii. 26. 



G. Vahlii, Schkuhr, Riedgr. 87. 

 G. media, R. Br. App. Frankl. Narr. 763. 



G. alpina, var. nigrescens, Oluey, Prelim. Cat. Wheeler's PL 53. 

 From Isle Royale, Lake Superior, and the mountains of Colorado 

 and Oregon, to Arctic America. Europe. Asia. 



Var. HOLOSTOMA. 



C. holostoma, Drej. Revis. Crit. Car. 29. 

 Differs from G. alpina chiefly in its beakless perigynium. — Green- 

 land, Fries, Warming & Holm, etc. 



