436 MINNESOTA BOTANICAL STUDIES. 



Conspectus of Species of Cypripedium in Atlantic Region 

 of North America. 



I. Leaves numerous. A. Sepals free. 

 Arietina. 

 Labellum conical. 

 1 C. arietinum R. Br. 



II. Leaves numerous. B. Sepals united. 



FOLIOSA. 



Sepals ovate. Labellum large, pink. 

 Leaves with setulose marginal vein, 



2 C. reginae Walt. 



Inferior sepals imperfectly united. Label- 

 lum small, ovate,white, dull, sepals brownish. 

 Stigmatic area, quadrangular. Leaves crowd- 

 ed, erect, with marginal vein, 



3 C. candiclum Muhl. 



Inferior sepals united imperfectly. Label- 

 lum rough, dull yelloAV. Stigmatic area with 

 distinct border. Nodal areas strongly pube- 

 scent, 



4 C. liirsutum Mill. 



Superior sepals broadly ovate. Petals lan- 

 ceolate, wavy, glossy, brown. Labellum 

 bright yellow. Stigmatic area, ovate, con- 

 cave. Fragrant, 

 5 C. parviflorum Salisb. 



III. Leaves tioo. G. sepals united. 



DiPHYLLA. 



Superior sepal inclined. Labellum bilobed, 

 ruddy. Staminodium rhomboidal, 

 6 C. acaule Ait. 



Cypripedium arietiuuni R. Br. 



Floiver small, sepals free to the base, labellum conical. 



Cryosanthes borealis B,AF. Jour. Phys. 89:102. 1819. 



Arietinum americanum Beck. Bot. 352. 1833. 



C arietinum R. Br. Ait. Hort. Kew. ed. 2. 6:222. 1813. 

 Nuttall. Gen. N. Am. PI. 2:199. 1818; Mac. Cat. Can. PI. 2:22 1880; 

 Pursh. Fl. N. Am. Septen. 595. 1814; Dame and Collins. Fl. M'dsex 

 Co. Mass. 104. 1888; Torrey, J. Fl. N. Y. 2:286. 1843; Beal and 

 Wheeler. Mich. Fl. 138. 1891; Bull. Me. Coll. Lab. 1893; Fernald. 

 Port. Cat. Me. PI. 64. 1892; Loudon, Hort. Brit. 373. 1830; Loddiges, 

 C. Bot. Cal. PI. 13:1240; PI. 1240. 1827; Gray, A. Man. Bot. 510. 1890; 

 Meehan, T. U. S. Fl. and Ferns, Ser. ii 2:25: PI. 6. 1880; Upham, W. 

 Minn. Phan. 142. 1884; MacMillan. Metasp. Minn. Val. 164. 1892. 



A slender perennial, slightly puberulent, which is usually 

 about two and one-half dm. high. The rhizome of this species 



