ORCHlDACEyE. 



Shady woods. Can. to Virg. July, Aug. 1|.. Rhizoma creeping. Scap 

 68 inches high. Leaves less distinctly veined than in the preceding. Flowert 

 greenish-white. Smaller Goodyera. 



VI. CYPRIPEDEJE. Anthers 2, with a large dilated lobe or abortive 

 stamen between them. 



17. CYPRIPEDIUM. Linn. Ladies' Slipper. 

 (From the Greek Kvrotj, Venus, and nodcuv, a shoe.} 



Perianth with the two outer lateral (or lower) segments mostly 

 united nearly to the apex. Lip large and inflated. Column 

 short, cernuous, 3-lobed; the middle lobe (sterile stamen) 

 dilated and petaloid. 



1. C. candidum Willd: stem leafy; leaves oblong-lanceolate; lip com- 

 pressed, shorter than the lanceolate segments of the perianth ; sterile stamen 

 lanceolate, rather obtuse. 



Penn. Muhl. May. ^.Resembles C. Cakeolus ; but the flowers are white 

 and not half the size ; the form of the leaves and of the sterile stamen distinguish 

 it sufficiently. Pursh. A doubtful species. White Ladies' Slipper. 



2. C. parviflorum Willd. : outer segments of the perianth ovate-oblong, 

 acuminate ; inner ones lance-linear, contorted ; lip shorter than the peri- 

 anth ; sterile stamen triangular, acute. C. Calceolus Mich. 



Woods and swamps. Can. to Car. W. to Miss. May, June. TJ.. Stem 

 12 18 inches high. Leaves ovate, clasping at base, pubescent. Flowers soli- 

 tary or in pairs. Outer segments of the perianth green with purple stains ; lip 

 yellow, spotted, an inch and a half long, inflated. Yellow Ladies' Slipper. 



3. C. pubescens Swartz : stem leafy; outer segments of the perianth lan- 

 ceolate, acuminate ; inner ones very long, linear and contorted ; lip laterally 

 compressed, shorter than the inner segments; sterile stamen triangular, 

 obtuse, (acute, Hook.) 



Woods. Subarct. Amer. to Car. W. to Miss. May. %.. Stem 12 feet 

 high. Leaves large, ovate-lanceolate, pubescent. Flowers solitary or in pairs. 

 Segments of the perianth greenish-yellow, spotted with purple ; lip yellow, 

 1 li inches long, much inflated. Closely resembles the preceding, but prob- 

 ably distinct. Large Yellow Ladies' Slipper. 



4. C. spectabile Swartz: stem leafy; outer segments of the perianth 

 ovate, obtuse, longer than the flat lanceolate inner ones : lip longer than the 

 inner segments ; sterile stamen cordate-ovate, obtuse. C. Canadense Mich. 



Swam s and bogs. Can. to Car. June, July. 1\. Stem 12 feet high. 

 Leaves ovate-lanceolate, plaited, resembling those of Veratmm viride. Flowers 

 2 3, very large. Segments of the perianth white ; Zip variegated with stripes 

 of purple and white, an inch or more long, much inflated. 



Showy Ladies'. Slipper. 



5. C. acaule Ait : scape leafless, 1-flowered ; radical leaves 2, oblong, 

 obtuse; outer segments of the perianth ovate-lanceolate; lip cleft in front; 

 sterile stamen roundish-rhomboid, acuminate, deflected. C. humik Salistt. 



Shady woods. Subarct. Amer. to Car. May, June. *2j.. Scape 6 10 inches 

 high, with two oval or elliptic-lanceolate leaves near the base. Flower solitaf 



