FLOWERING PLANTS AND FERNS OF INDIANA. 727 



P. Convolvulus L. Biack Bindweed. 



In all parts of the State in waste places and cultivated fields. 

 In some few localities, where the soil is a rich, sandy loam, it has 

 become a troublesome weed. Usually trailing, though frequently 

 twining about low shrubs or fallen branches. 



Flowers from June until September. 



Tippecanoe (Cunningham); Jay, Delaware, Randolph and 

 Wayne (Phinney); Putnam (MacDougal); Jefferson (J. M. Coul- 

 ter); Clark (Baird and Taylor); Kosciusko (Chipman); Vigo 

 (Blatchley); Steuben (Bradner); Marion (Moffatt). 



P. scandens L. Climbing False Buckwheat. 



(P. dumetorum scandens Gray.) 



Abundant in all parts of the State, growing in moist woods and 

 thickets. It covers bushes, brush heaps and fences in its vigorous 

 growth in favorable localities. The vines frequently exceed 

 20 feet in length. 



Flowers from July through September. 



Daviess (Clements); Clark (Baird and Taylor); Jay, Delaware, 

 Eandolph, and Wayne (Phinney); Noble (Van Gorder); Jeffer- 

 son (Barnes); Franklin (Meyncke); Putnam (MacDougal); Gibson 

 and Posey (Schneck); Hamilton (Wilson); Vigo (Blatchley); 

 Steuben (Bradner). 



P. dumetorum L. Hedge Buckwheat. 



This western form has entered the State along the line of east 

 and west railways. Frequently not separated from the preceding, 

 which it resembles. 



Flowers from July to September. 



Fayette (Hessler); Putnam (MacDougal); Hamilton and Marion 

 (Wilson). 



P. sagittatum L. Arrow-leaved Tear-Thumb. 



Widely distributed and very abundant, growing in low, wet 

 places in rich soils. Either decumbent or climbing over other 

 plants by the strong recurved prickles which arm the angles of 

 the stem. 



Flowers from July through September. 



Tippecanoe (Cunningham); Cass (Hessler); Jay, Delaware, 

 Randolph and Wayne (Phinney); Noble (Van Gorder); Clark 

 (Baird and Taylor); Vermillion (Wright); Jefferson (Barnes); 

 Putnam (MacDougal); Gibson and Posey (Schneck); Franklin 

 (Meyncke); Cedar Lake (Deam); Knox (Spillman); Vigo (Blatch- 

 ley); Hahiilton and Marion (Wilson); Steuben (Bradner). 



48-Geol. 



