STATE GEOLOGIST. 115 



A. obtusifolia, Michx. Milkweed. 

 Lapham. South. 



A . tuberosa, L. Butterfly- weed. Pleurisy-root. 



Common, or frequent, through the south half of the state ; extending north to the 

 upper Mississippi river, Garrison, and Fergus Falls, Leonard; not observed in Clay 

 county, Gedge. 



A. verticillata, L. Whorled Milkweed. 



Frequent southeastward ; extending north to Otter Tail county, Upliam, Clay 

 county (common), Gedge, and Pembina, CMcTiering. 



ACERATES. Ell. Green Milkweed. 



A. viridiflora. Ell. Green Milkweed. 



Occasional through the south half of the state and in the Red river valley. 



A. viridiflora, Ell., var. lanceolata. Gray. Green Milkweed. 



Blue Earth county (frequent), Leiberg; Clay county. Red river valley, Gedge. [With 

 lanceolate leaves 2\i to 4 inches long. Gray's Synoptical Flora of N. A.] 



A. viridiflora. Ell., var. linearis, Gray. Green Milkweed. 



Clay county, Gedge. West. [With elongated linear leaves and low stems : 

 umbels often solitary.— Winnipeg Valley to New Mexico. Gray's Synoptical Flora of 



JV. A.] 



A. lanuginosa, Decaisne. Green Milkweed. 



Winona county, Holzinger; Blue Earth county, Leiherg; Minneapolis, Juni, R')Mrts; 

 Redwood Falls, Pemberton; Clay county. Red river valley, Gedge. (Specimens with 

 some of the leaves having two equally prominent mi.lribs and the end bifld were col- 

 lected in Clay county by Prof. Gedge.) South and west. 



A. longifolia, Ell. Green Milkweed. 



Freeborn county, Upham; Cannon River Falls, Blaise, Sandherg; frequent in Martin 

 county, and in Emmet county, Iowa, Cratty; Stearns county, AZrs. Blaisdell; upper 

 Mississippi river. Garrison. South. 



OLEACE^. Olive Family. 



FRAXINUS, Tourn. Ash. 



F, Americana, L. White Ash. 



Frequent, often common, throughout the state, excepting far northward. The 

 white and black ash are well known as valuable timber trees. 



F. pubescens, Lam. Red Ash. 



Frequent from lake Pepin, Miss Manning, to Stearns and Todd counties and Sand 

 Hill river, Upham; the White Earth reservation, Garrison; reaching its northern 

 limit on Rainy river, Richardson. 



F. viridis, Michx. f. Green Ash. 



Common, or frequent, throughout the state; extending north at least to Rainy river 

 and the lake of the Woods, and common along the Rf d river in ^lanitol a, Bell; the 

 nwist common species of ash in Iowa, Arthur. 



F. sambucitblia, Lam. B'ack Asb. 



Frequent, occasionally plentiful, throughout the state, excepting perhaps south- 

 westward. [Its northwestern limit reaches Ihe southern part of lake Winnipeg, aud 

 thence extends southward along the east side of Red river. Bell.] 



F. quadrangiilata, Michx. Blue Ash. 



Upper Mississippi river, Garrison; near the Rainy lake valley^ Clark. Rare. 



