Fox: SPEiCIES OF CYPRIPEDIUM. 



449 



DESCRIPTION OF PLATES. 



Plate XXI. Map of North America, showing distribution of the genus Cyp- 



ripedium. 

 Plate XXII. Cypripedium arietinuniB,. Bii. 



a. General aspect. 



b. Arrangement of essential parts. 



c. Ovate staminodium. 



d. Quadrangular stigma. 



e. Bilocular anther. 



/. Ovary with distinct ridges. 



g. Basal portion of plant, rhizome and fibrous rootlets. 

 Plate XXIII. Cypripedium reginae Walt. 



a. Leaves and inflorescence. 



b. Obovate staminodium. 



c. Lateral view of column and anther. 



d. Distinctly trilobed stigma and pair of anthers. 



e. Anther. 



/. Large angular capsule. 

 g. Rhizome with cicatrices and rootlets. 

 Plate XXIV. Cypripedium candidum MuiiL. 



a. Foliar and floral appearance. 



b. Closely united staminodium, column, and anther. 



c. Ovate lanceolate staminodium. 



d. Quadrangular stigma. 



e. Cylindrical rhizome. 

 Plate XX 7. Cypripedium hirsutum Mill. 



o. Aerial portion of plant. 



b. Horizontal staminodium and reflexed stigmatic area. 



c. Ovate-lanceolate staminodium. 



d. Slightly concave stigma with distinct margin. 



e. Dorsal view of column and extrorse stamens. 

 /. Magnified view of anther. 



g. Capsule. 



h. Sheathing leaves and dark colored rhizome. 

 Plate XXVI. Cypripedium parvijlorum Salisb. 



a. Flower and foliage. 



b. Lateral view of deflexed staminodium and column. 



c. Ovate-lanceolate staminodium. 



d. Geniculate column attached to ovary. 



e. Long obovate stigma. 

 /. Small capsule. 



g. Rhizome showing numerous scars. 

 Plate XXVII. Cypripedium acaule Ait. 



a. General appearance of plant. 



b. Strongly deflexed column. 



c. Acutely rhomboidal staminodium. 



d. Triangular stigma with hoiry projections. 



e. Lateral view of anther. 



/. Magnified view of anther. 

 g. Indistinctly ridged ovary. 

 h. Fibrous rootlets of young plant. 



