XXIV. ON THE GENUS CYPRIPEDIU3I L. WITH 

 REFERENCE TO 3IINNES0TA SPECIES. 



Henrietta G. Fox. 



Orchidaceae. Diandrae-Cypripedinae. 



Cypripedium Linn. 



Flowers zygomorphic, simple, subtended by a bract; calyx 

 3 parted, inferior sepals often united; corolla 3 parted, lateral 

 petals usually patent; third petal, large, inflated, saccate, diff- 

 ering in color from the paired petals; sterile stamen 1, mem- 

 branous, partially closing orifice of lip; fertile stamens 2, in- 

 trorse, attached to fleshy, dellexed column; ovary long, inferior. 



Cjpripedium L. Sp. PI. 951. 1753. 



Calceolus Adaxs. Fani. 2: TO. 1763. 



Criosanthes Rafin. Journ. Phys. 81): 102. 1819. 



Cordula Uwis. Fl. Tellur. 4: 46. 1836. 



Menephora Rafin. Fl. Tellur. 4: 46. 18.36. 



Sacodon Rafin. 1. c. 45. 1836. 



Stimegas Rafin. 1. c. 1836. 



Corisantlies Steud. Noru. Ed. 2: 1: 474. 1840. 



Hypodema Reichb. Nom. 56. 1841. ^ 



Cypripedilum Asciiekson. Fl. Brandenb. 1864. » 

 Perennial herbs ranging from one to seven decimeters in 

 height. Rhizomes, cylindrical, bearing old scars or cicatrices 

 and fibrous roots, often persisting for years. Leaves, from 

 two to several in number, alternate, sheathing the plant axes; 

 veins parallel, frequently prominent, leading to plication in 

 species of temperate regions. Peduncle, erect, terete, sur- 

 mounted by an ovate to ovate lanceolate bract. Flowers resu- 

 pinate by reason of the torsion of the ovary, terminal; when 

 more than one, seldom three to seven in number, arranged in a 

 simple raceme. Perianth, persistent, six-parted, the three 

 divisions of the outer whorl appearing as unpaired sepals, the 

 inner whorl forming the petals. Sepals three, the upper mem- 



(1) Hooker and Jackson. Index Kew. 1 : 701. 1893. 



(2) Rolfe, R. A. Nat. Scl. 3 : 327. 1893. 



