PLANTS OF IOWA 165 



ALSINE, L. 



2126. A. media, L. Common Chickweed. 

 Common weed in waste places. Introduced. 



2127. A. longifolia, Muhl. Long-leaved Stitchwort. 

 Common in wet meadows. 



CERASTIUM, L. 



2128. C. viscosum, L. Mouse-ear Chickweed. 

 Introduced from Europe. 



2129. 0. vulgatum, L. Large Mouse-ear Chickweed. 

 Frequent. 



2130. C. longipedunculatum, Muhl. Nodding Chickweed. 

 Common in moist woods. 



2131. C. arvense* L. Field Chickweed. 

 Frequent. 



2132. C. arvense oblongifollum, (Torr.) Holl. & Britt. 

 In rocky places. 



ARENARIA, L. 



2133. A. michauxii, (Fenzl.) Hook. Rock Sandwort. 

 Not common. 



MCEHRINGIA, Ehrh. 



2134. M. lateriflora, L. Blunt Leaved Sandwort. 

 In moist shaded places. 



ANYCHIA, Michx. 



2135. A. canadensis, (L.) B. S. P. Slender Forked Chick- 



weed. 

 In dry places. 



. WATER-LILY FAMILY. 



BRASENIA, Schred. 



2136. B. purpurea, (Michx.) Casp. Water-shield. 

 Infrequent. 



NYMPH^A. 



2137. N. advena, Sol.. Yellow Pond Lily. 

 In permanent ponds; common. 



