MICHIGAN ACADEMY OF SCIENCE. 245 



4. Cypripedium parviflorum Salisb. (small-flowered). 

 Yellow Ladies'-slipper. 



Frequent in the southern part of the Lower Peninsula; apparently rarer 

 farther north. May- June. 



This rather slender species prefers very wet swamps, where it grows in clumps. 

 Corolla smaller and brighter j^ellow than the following. The specific name is unfortun- 

 ate. 



Specimens exammed: — Gratiot Co. (C. A. Davis, June, 1888); Cheboygan .Co. 

 (F. C. Gates, July, 1911); Ingham Co. (F. L. Sleeper, June, 1867); Kent Co. (L. J. 

 Cole, May, 1895); Kalamazoo Co. (F. A. Tuthill) ; Emmet Co. (F. C. Gates, 1917); 

 Jackson Co. (S. H. and D. R. Camp, May, 1898) ; St. Clair, (C. K. Dodge, May, 1894). 



Reported from: — Calhoun Co. (C. E. Barr); Macomb and Washtenaw counties 

 (I. W. Stacey); Isle Royale (W. P. Holt); "from Bay Co. to St. Ignace, and on Mack- 

 inac Island," (C. K. Dodge); Oakland Co. (C. Billington) ; Marquette Co. (C. K. 

 Dodge, 1918). 



4a. Cypripedium parviflorum var. pubescens (Willd.) Knight, (downy). 

 Downy Yellow Ladies'-slipper. 



The distrib,utiou of this plant throughout the state is practically identical with 

 Cypripedium parviflorum. May — June. Mostly found in woods and thickets. 

 The plant is larger in every way than C. parviflorum and the flowers are light yellow. 

 The roots and rootstocks of this 'and the foregoing are medicinal. The glandular 

 hairs are irritant to the skin of some people. 



Specimens examined: — Marquette Co. (B. Barlow, June, 1901); Mackinac Island 

 (G. H. Hicks, June, 1889); Oscoda Co. June, 1888; Gratiot Co. (C. A. Davis, June, 

 1888); Ingham Co. (F. L. Sleeper, June, 1867); St. Clair Co. (C. K. Dodge, 1893). 



Reported from :— Muskegon Co. (C. D. McLouth) ; Calhoun Co. (C. E. Barr); 

 Oakland Co. (C. Billington); Washtenaw Co. (I. W. Stacey); Kent Co. (Emma Cole); 

 Isle Royale (W. P. Holt, 1908); Cheboygan Co. (F. C. Gates); Tuscola Co. (C. K. 

 Dodge); "from Bay Co. to St. Ignace and on Maehinac Island" (C. K. Dodge). 



The Northern Ladies'-slipper (Cypripedium passer num. Richards) reported from 

 Ontario and on north, should be sought for in the Upper Peninsula. Stem 1.5-2.6 

 dm. high, villous pubescent; sepals and petals shorter than the lip; lip 10-15 mm. long, 

 pale magenta, spotted with deeper magenta at the base within. 



2. FISSIPES Small. 



Fissipes acaulis (Ait.) Small, (stemless). 

 Cypripedium acaule Ait. 



Moccasin Flower. Stemless Ladies'-slipper. 

 Woods and sphagnous swamps, frequent throughout. "In shady, sandy ground 

 along the Huron shore, but seldom abundant". Dodge. May-June. 



There seems to be some e^adence of there being two forms of this species, one 

 thriving in wet ground, and the other in more or less dry situations. 



