EXOGENOUS PLANT S. 



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common Anise, belonging to a very distinct family, which this plant so closely resembles in taste. 

 Lophanthus nepetoides, (Benth.) Falls of St. Croix. Lophanthus scrophularifolius, (Benth.) All three 

 of the above species are found side by side at the Falls of St. Croix, and exhibit a fine example of gradation 

 of specific characters. Pycnanthemum pilosum, (Nutt.) Dry hills. Iowa. Pycnanthemum lanceola- 

 tum, (Pursh.) Thickets in Iowa and Minnesota. Prunella vulgaris, (L. ) Common Heal-all. Scutel- 

 laria parvula, (Michx.) May. Gravelly borders of the Upper Mississippi. Scutellaria galericulata, 

 (L.) Wet places. St. Croix. Scutellaria laterifolia, (L.) Wet places. Iowa and Minnesota. Scu- 

 tellaria versicolor, (Nutt.) Copses. Davenport, Iowa. Physostegia Virginiana, (Benth. ) July. River 

 margins. Upper Mississippi, St. Peter's, and St. Croix. Leonurus Cardiaca, (L.) Mother-wort. About 

 houses. Galeopsis Tetrahit, (L.) Lake Superior. Stachys hispida, (Pursh.) Margins of rushy ponds. 

 Iowa. Teucrium Canadense, (L.) Low grounds. St. Croix. 



Boraginace.e. — Onosmodium molle, (Mickx.) About gopher-holes, on prairies. Iowa and Minne- 

 sota. Lithospermum latifolium, (Michx.) May. Rock Island, Illinois. Batschia Gmelini, (Michx.) 

 June. Dry, sandy ridges. Iowa and Minnesota. Batschia canescens, (Michx.) Hoary Puccoon. More 

 abundant than the preceding species, and growing on richer soil. Its root furnishes a common dye, 

 used by the Indians. Batschia longiflora, (Nutt. ) May. Banks of the Mississippi Liver, near Daven- 

 port, Iowa. Mertensia Virginica, (D. C.) April. Lung-wort. Davenport. Echinospermum Lappula, 

 (Lehm.) Stick-seed. Waste places. Cynoglossum officinale, (L.) Hound' s-tongue. Roadsides. Cy- 

 noglossum Virginicum, (L.) Portage between the St. Croix and Bois Brule Rivers. Cynoglossum Mori- 

 soni, (D. C.) Waste places about villages. Iowa. 



Hydrophyllace.e. — Hydrophyllum Virginicum, (L.) June. Rich woods. Iowa and Minnesota. 

 Hydrophyllum appendiculatum, (Michx.) June. Copses. Iowa. Ellisia ambigua, (Nutt.) May. 

 An evanescent weed, common about cultivated fields and gopher-holes. Iowa and Minnesota. 



PolemoniacevE. — Polemonium reptans, (L. ) May. Shady places, near Davenport, Iowa. Phlox 

 maculata, (L.) June. Wet places on prairies. Iowa. Phlox pilosa, (L.) June. Common on prairies 

 throughout the Northwest. Phlox divaricata, (L.) April. Shady hillsides. Iowa. 



Convolvulace/E. — Calystegia sepium, (R. Br.) Bindweed. Copses. Iowa and Minnesota. Cuscuta 

 Gronovii, (Willd.) Common dodder. Low grounds. Cuscuta glomerata, (Choisy.) Mississippi bot- 

 toms, near Rock Island, Illinois. 



SolanacevE. — Datura Stramonium, (L.) Waste places, interior of Iowa. A close attendant on the 

 steps of the pioneer physician. Physalis viscosa, (L. ) Dry fields, Iowa and St. Peter's. A narrow- 

 leaved variety, which is often confounded with the P. lanccolata of Michaux, is frequently met with. 

 Solanurn nigrum, (L. ) Waste places. St. Croix. 



Gentianace.e. — Gentiana quinqucflora, (Lam.) Dry prairies, Iowa. Gentiaua crinita, (Frool.) 

 Fringed gentian. Moist grounds, St. Croix. Gentiana Saponaria, (L.) Moist river banks. Upper 

 St. Croix. A pure white variety is often met with. Menyanthes trifoliata, (L.) Bogs. St. Croix and 

 St. Peter's. Halenia deflexa, (Griseb. ) Bois Brule River bank and south shore of Lake Superior. 



ApocynaceyE. — Apocynum androstcmifolium, (L. ) June. St. Croix. Apocynum cannabinum, (L.) 

 River-banks throughout the Northwest. 



Asclepiadace^e. — Asclepias Cornuti, (De Caisne.) Copses of the Northwest. Asclepias phytolac- 

 coides, (Pursh.) Copses. St. Croix. Asclepias purpurascens, (L.) Hills. Davenport, Iowa. Ascle- 

 pias obtusifolia, (Michx.) Dry, sandy prairies, Iowa. Asclepias Mcadii, (Torr.) June. Of a singular 

 isolated habit, but not rare on dry, rolling prairies. Iowa. Asclepias incarnata, (L.) Swamps. Iowa 

 and Minnesota. Asclepias tuberosa, (L.) Butterfly-weed. June. Dry prairies. Iowa and Minnesota. 

 Asclepias verticillata, (L.) Dry hills. Davenport, Iowa. Acerates longifolia, (Ell.) Moist places, 

 Iowa. Acerates viridiflora, (Ell. ) June. Dry hills and prairies. Iowa and Minnesota. 



Oleace/e. — Several species of Ash (Fraxinus), were observed, but I have not the means at hand for 

 identifying them. 



AristolochiacevE. — Asarum Canadense, (L. ) Wild ginger. Rich woods. Iowa and Minnesota. 



Chenopodiaceye. — Chenopodium album, (L.) Cultivated fields. Iowa. Chenopodium hybridum, 

 (L. ) St. Croix. Blitum capitatum, (L.) La Pointe. Lake Superior. Acnida cannabina, (L. ) St. 

 Croix. River margins. 



Amaranthace/e. — Amaranthus hybridus, (L.) Fields and gopher-holes. Iowa and Minnesota. 

 Amaranthus graecizans, (L.) A weed springing up wherever there is a garden. 



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