IOWA ACADEMY OF SCIENCES. 
153 
Delphinium tricorne Michx. Very common in low grounds. 
BERBERIDACEAE. 
Berheris vulgaris L. Escaped from cultivation. 
PAPAVERACEAE. 
Sanguinaria canadensis L. Common in woodlands. 
FOMA RIACEAE. 
Dicentra cucullaria DC. Very common in woods. 
Corydalis aurea Willd. Not uncommon. 
CRUCIFERAE. 
Capsella bursa-pastoris (L) Moench. 
Lepidium virginicum L. 
Sisymbrium officinale (L) Scop. 
Brassica nigra (L) Koch. 
B. sinapistrum Boiss. 
Arabis Canadensis L. 
Cardamine hirsuta L 
Nasturtium armoracia (L) Fries. 
N. officinale R. Br. 
Raphanus sativus L. Escaped from cultivation. 
CAPPARIDACEAE. 
Polanisia trachysperma T. and G. 
YIOLACEAE. 
Viola pedata L. 
V. blanda Willd. Not common. 
V. cucullata Ait. 
V. pubescens Ait. 
CARYOPHYLLACEAE. 
Silene stellata Ait. 
N. 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. 
Linum usitatissimum. Escaped from cultivation. 
L. sulcatum Riddell. Not very common. 
