MARYLAND WEATIIEE SERVICE 419 



DIOSCOREACEAE. 



Dioscorea villosa L. Wild Yam-root. 



Throughout the state; in moist and dry forests; common. 



IRIDACEAE. 



Iris versicolor L. 



Throughout the state; being most common in fresh marshes and swamps 



in the Coastal Zone. 

 Charles County, Allen Fresh (1536). 



Iris verna L. 



Coastal Zone; in moist forests, on sandy soil; infrequent. 

 Anne Arundel County, Glenburnie (Robert K. Miller). 



Sisyrinchium graminoides Bicknell. 



Coastal and Midland Zone; in moist forests and open situations; 



common. 

 Talbot County, Easton (1495). 



ORCHIDACEAE. 



Cypripedium acaule Ait. Moccasin Flower. 



Coastal and Midland Zone; in dry forests; preferring sandy soil; 

 common in the Coastal Zone, less frequent in the Midland Zone. 



Cypripedium hirsutum Mill, (pubescens Willd.) Large Yellow Ladies' Slipper. 

 Mountain Zone; in moist forests; frequent. 

 Garrett County, Oakland (Joseph E. Harned). 



Cypripedium parviflorum Salisb. Small Yellow Ladies' Slipper. 



Midland and Mountain Zones; moist forests, being rare in the Midland 



Zone, frequent in the Mountain Zone. 

 Garrett County, Oakland (Joseph E. Harned). 



Orchis spectabilis L. Showv Orchis. 



Throughout the state; in moist forests; infrequent. 



Habenaria orbiculata (Pursh.) Torr. Large Round-leaved Orchis. 



Vpper Midland District and Mountain Zone; in moist forests; rare. 

 Garrett County, Boiling Spring (1970). 



Habenaria bracteata (Willd.) R. Br. Long-bracted Orchis. 



Garrett County, Boiling Spring (1969). 



Habenaria clavellata (Michx.) Spreng. Small Green Wood Orchis. 



Throughout the state; in moist forests, swamps and bogs; common. 



