46 
IOWA ACADEMY OF SCIENCE 
DIOSCOREACEAE. 
DIOSCOREA (Plumier) L. 
254. Dioscorea villosa L. Wild Yam Root. Common in woods and 
thickets. 
AMARYLLID ACE AE . 
HYPOXIS L. 
255. Ilypoxis hirsuta (L.) Coville. Yellow Star Grass. Common in 
moist soil. 
IRIDACEAE. 
IRIS (Tourn) L. 
256. Iris versicolor L. Blue Flag. In swamps and marshes. 
SISYRINCHIUM L. 
257. SisyrincMum angustif olium Mill. Northern Blue-eyed Grass. 
Common in moist places. 
258. SisyrincMum gramineum Curtis. Common Blue-eyed Grass. Much 
less common; sandy soils. 
ORCHID ACE AE. 
CYPRIPEDIUM L. 
259. Cypripedium parviflorum Salisb. Yellow Lady’s Slipper. Not 
rare in woodlands. 
260. Cypripedium parviflorum Var. pubescens (Willd.) Knight. 
Downy Lady’s Slipper. Less common. 
ORCHIS (Tourn) L. 
261. OrcMs spectabilis L. Showy Orchis. Scarce in rich woodlands. 
HABENARIA Willd. 
262. Habenaria leucophaea (Nutt) Gray. Prairie White Fringed Or- 
chis. Scarce in moist meadows. 
