204 
IOWA ACADEMY OF SCIENCES. 
Unifolium. 
158. U. canadense (Desf.) Greene. {Maianthemum cana 
dense Desf.) Eocky river banks; infrequent. 
POLYGONATUM. 
154. P. hijiorum (Walt.) Ell. Common in woods. 
155. P. commutatum (E. & S.) Dietr. (P gigantum Dietr.) 
Common in thickets and meadows. 
Trillium. 
15b. T. nivale Eidd. High woods; common locally. 
157. P. erectum L. Frequent in rich, damp woods. 
SMILACE.®. 
Smilax. 
158. S. kerhacea L. Common in thickets. 
159. S, ecirrhata (Eng.) Wats. Abundant in woods and 
meadows. 
160. S. hispida Muhl. Frequent in moist woods. 
AMARYLLIDACE^. 
Hypoxis. 
161. H, hirsuta (L.) Cov. (AT. erecta L.) Moist meadows 
and dry banks; abundant. 
Dioscorea. 
162. P. villosa L. 
DIOSCORIACE^, 
Common in woods and thickets. 
IRIDACE^. 
Iris. 
163. I, versicolor L. Common along streams and about 
swamps. 
Sisyrinchium. 
164. S. angustifoliuni Mill. Common in dry open ground. 
ORCHIDACE^. 
Cypripedium. 
165. C. candidum Willd. Frequent in wet meadows. 
166. C. hirsutuniWiW. iC . puhescensY^iWdi,) Dry woods 
and thickets; infrequent. 
