1^4 UNIVERSITY OF MISSOURI STUDIES [SS^ 



738. A. incarnata L. Swamp milkweed. 

 Frequent along streams and in low grounds. 



New Brunswick to the Northwest Territory; Tenn- 

 essee to Louisiana and Kansas. 



739. A. Oornuti Decne. [^A. Syriaca L.]. Common milk- 

 weed. Silkweed. 



Very common in fields and waste places. 



New Brunswick to Saskatchewan; Georgia to Kansas. 



740. A. quadrifolia L. Four-leaved milkweed. 

 Common in woods and thickets. 



Maine and Ontario to Minnesota; North Carolina to 

 -Arkansas. 



741. A. verticillata L. Whorled milkweed. 

 Common in dry fields and thickets. 



Maine and Ontario to the Northwest Territory; 

 Florida to New Mexico and Mexico. 



309. ENSLENIA Nutt. \AMPELANUS Raf.: 

 GONOLOBUS Michx.]. Climbing milkweed. 



742. E. albida Nutt. \^A.albidus{^\iX.V?jV>x\'iion:G.laevis 

 Michx.]. Sand vine. 



Thickets, old pastures and roadsides. 



Pennsylvania to Illinois and Kansas; Florida to Texas. 



Order 35. TUBIFLORALES. 



Family 89. CONVOLVULACEAE Vent. Bindweed family. 



310. IPOMOBA L. Morning-glory. 



743. I. pandurata L. Man-of-the-earth. 

 Dry thickets and hillsides; common. 



Connecticut and Ontario to Michigan; Florida to 

 Texas and Kansas. 



744. I. lacunosa L. Small wild morning-glory. 

 Fence-rows and low grounds; rare. 



Pennsylvania to Illinois and Kansas; South Carolina 

 to Texas. 



