EXOGENOUS PLANTS. 609 
culus fascicularis, (Muhl.) April. Dry river banks. Ranunculus repens, (L.) May. Wet places, com- 
mon. Caltha palustris, (L.) May. Swamps. Coptis trifolia, (Salisb.) Bogs. St. Croix. Isopyrum 
biternatum, (Torr and Gr.) Shady woods, Blue Earth River. Aquilegia Canadensis, (L.) June. Rocks. 
Delphinium azureum, (Michx.) June. A characteristic Larkspur, growing on sandy ridges or high 
prairies, Iowa and Illinois. Actawa rubra, (Willd.) May. Woods and Copses, Iowa. Actza alba, 
(Bigel.) With the preceding. 
ANoNACEH.—Asimina triloba, (Duval.) April. ‘ Papaw.” Head of Des Moines Rapids, Missis- 
sippi River. 
MENISPERMACE.—Menispermum Canadense, (L.) May. A common vine. The root is a popular 
tonic. 
BERBERIDACEH.—Leontice thalictroides, (L.) April. Woods. Podophyllum peltatum, (L.) May. 
Rich woods, the fruit eatable; the root cathartic. 
CABOMBACE#.—Brasenia peltata, (Pursh.) July. “‘ Water shield.” Floating on shallow lakes, St. Croix. 
NYMPHMACEH.—Nymphea odorata, (Ait.) July. Water lily. Nuphar advena, (Ait.) July. 
Yellow water lily. 
SARRACENIACE®.—Sarracenia purpurea, (L.) June. Pitcher plant. Bogs of the St. Croix. 
PAPAVERACE®.—Sanguinaria Canadensis, (Linn.) April. The medicinal blood root. 
FuMARIACE&.—Dicentra Cucullaria, (D. C.) April. Rich woods. Corydalis aurea, (Willd.) May. 
River banks. A very variable plant, according to the character of the soil in which it grows. Cory- 
dalis glauca, (Pursh.) August. Trap rocks, at Falls of St. Croix. 
Crucirera%.—Nasturtium sinuatum, (Nutt.) July 14th. River bank, Lower St. Peter’s. Found 
also in similar situations in Oregon. Nasturtium palustre, (D.C.) July. River banks. Nasturtium 
natans, (D. 0.) July. A singular aquatic species, more common in the West than at the Kast. Car- 
damine rhomboidea, (D. C.) May. Wet places in prairies, Iowa. Cardamine hirsuta, (L.) May. 
Moist margins of brooks. Dentaria laciniata, (Muhl.) April. Rich woods. Arabis lyrata, (L.) May. 
Rocks. Galena, Ill. Arabis dentata, (Torr. and Gr.) June. River banks. Arabis hirsuta, (Scop. ) 
May. Rocky places, head of Lake St. Croix. Arabis levigata, '(D.C.) May. Rocky river-banks. 
Arabis Canadensis, (L.) June. St. Peter’s and St. Croix. Erysimum cheiranthoides, (L.) July. 
River banks. Sisymbrium canescens, (Nutt.) May. Pastures and river-banks, Davenport, Iowa. 
Draba Caroliniana, (Walt.) April. Dry and exposed banks of the Mississippi, Davenport, and Rock 
Island. Lepidium Virginicum, (L.) Waste places. Capsella bursa-pastoris, (Meench.) Fields and 
streets. 
CAPPARIDACEE.—Polanisia graveolens, (Raf.) July. Gravelly banks of the Upper Mississippi. 
Vionacea.—Viola cucullata, (Ait.) April. Low grounds. Viola pedata, (L.) May. A showy 
species, adorning the rolling prairies of Iowa with its early blue blossoms. Viola delphinifolia, 
(Nutt.) May. Davenport and Upper Mississippi. Closely resembling the former, but readily distin- 
guished on a close examination. Viola Canadensis, (L.) June. St. Peter’s. Viola Muhlenbergii, (Torr.) 
May. Lake St. Croix. 
Crstacea.—Helianthemum Canadense, (Michx.) June. Dry hills and prairies. Towa and Minne- 
gota. Hudsonia ericoides, (L.) Common to the shores of Lake Superior, the barren ridges of the St. 
Croix, and the Atlantic sea-beach. Jechea minor, (Lam.) July. “ Pin-wee.” St. Croix. 
DRosERACEHX.—Drosera rotundifolia, (L.) July. “Sun-dew.” Moist sand on the margins of lakes. 
Minnesota. Parnassia Caroliniana, (Michx.) August. Wet places on prairies. St. Peter’s and St. 
Se i ladcainin.-Eiypenicdie pyramidatum, (Ait.) July. River banks Upper Mississippi and St. 
Peter’s. Hypericum Canadense, (L.) August. St. Croix River. Elodea Virginica, (Nutt.) July. 
i Northwest. 
Get arch Sled stellata, (Ait.) July. Woods and river banks. Silene nivea, (D. C.) 
July. Ravines. Davenport, Iowa. Silene antirrhina, (L.) June. Dry soil and exposed rocks. Towa 
and Minnesota. Arenaria stricta, (Michx.) July. Rooting on detached rocks, head of Lake St. Croix. 
Moshringia laterifiora, (Feuzl.) May. Wet places, St. Croix. Stellaria longifolia, a. May. 
Moist, grassy places, Upper Mississippi. Cerastium nutans, (Raf.) May. venues seme Upper 
Mississippi. Mollugo verticillata, (L.) August. Exposed rocks and sandy fields, St. a. 
PoRTULACACEH.—Portulaca oleracea, (L.) Crevices of rocks on the Upper St. Peter’s. Talinum 
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