IOWA ACADEMY OF SCIENCES. 153 



Delphinium tricorne Michx. Very common in low grounds. 



BERBEKIDACEAE. 



Berberis vulgaris L. Escaped from cultivation. 



PAPAVERACEAE. 



Sanguinaria canadensis L. Common in woodlands. 



FUMAlilACEAE. 



Dicentra cucullaria DC. Very common in woods. 

 Corydalis aurea Willd. Not uncommon. 



CRUCIFKKAE. 



Capsella bursa-pastoris (L) Moench. 

 Lepidiunt virginicum L. 

 Sisytnbtium officinale (L) Scop. 

 Brassica nigra (L) Koch. 

 B. sinapistrum Boiss. 

 Arabis Canadensis L. 

 Cardaniine hirsuta L 

 Nasturtium armoracia (L) Fries. 

 N. officinale R. Br. 

 ' Raphanus sativus L. Escaped from cultivation. 



CAPPARIDACEAE. 



Polanisia trachysperma T, and G. 



VIOLACEAE. 

 Viola pedata L, 



V. blanda Willd. Not common. 

 V. cucullata Ait. 

 V. pubescens Ait. 



CARYOPHYLLACEAE. 



Silene stellata Ait. 

 6*. nocturna L. 



PORTULACACEAE. 



Portulaca oleracea L. 



Claytonia virginica L Common in woodlands. 



HYPERICACEAE. 



Hypericum ascyron L. Common. 



MALVACEAE. 



Malva rotundifolia L. 



Abutilon avicennae Gaertn. Escaped from cultivation, or intro- 

 duced in grain seed. 



TILIACEAE. 



Tilia americana L. 



LINACEAE. 



Lintim usitatissimum. Escaped from cultivation. 

 L. sulcatum Riddell. Not very common. 



