222 IOWA ACADEMY OF SCIENCES. 



PORTULACACE^. 

 POKTULACA L. 



231). P. oleracea L. Purslane. A fleshy weed, very com- 

 mon in cultivated i^round, where it has become 

 naturalized from its native home in the south- 

 west, and tropical America. 



carvophyllace^. 

 Agrostemma L. 



240. A. yitJiago L. {Lychnis f/ifhrifjo Scop.) Corn 



Cockle. An European plant, adventive in wheat 

 fields. 



SiLENE L. 



241. S. stelluta (L.) Ait. Starry Campion. Common 



in woods. 



242. S. cuitirrliina L. Frequent in woods and waste 



places. 



243. S. nodlflora L. Introduced into waste places, 



Estherville. 

 Vaccaria Medic. Cow-herb. 



244. V. vaccaria (L.) Britton. {Saponaria vaccaria L.: 



Vaccaria ruh/aris Host.) A common Euro- 

 pean weed, adventive in wheatfields. 

 Alsine L. 



245. A. lorif/ifolia (Muhl.) Britton. {Stcllaria io)i(/ifo- 



lia Muhl.) Common in marshes. 



NYMPH.EACE^. 

 NYMPHiEA L. 



246. N. ad vena Soland. {Nupliar advena R. Br.) Yel- 



low Pond-lily. Common in lakes and ponds. 



Castalia Salisb. 



247. C. tuberosa (Paine) Greene. {Nijmphcea tuherosa 



Paine.) White Pond-lily. Once very com- 

 mon in lakes and ponds, but becoming rare. 



ranunculace^. 

 Caltha L. 



248. C. pahistrisL. Marsh Marigold. Rare: found only 



in a marshy spring in the woods north of Esther- 

 ville. 



