724 REPORT OF STATE GEOLOGIST. 



P. Pennsylvanicum L. 



Very abundant in moist, even wet, rich soils in all parts of the 

 State. Very variable as to size. In the rich muck soils, near the 

 borders of some of our northern lakes, specimens have been col- 

 lected over six feet in height, with widely spreading branches. 

 Forms from four to five feet in height are not exceptional in such 

 situations. The stems also become very hard and woody under 

 such conditions, and the flowering spikes from two to four inches 

 long. 



Flowers from July until in October. 



Tippecanoe (Cunningham); Daviess (Clements); Gibson and 

 Posey (Schneck); Franklin (Meyncke); Noble (Van Gorder); Ver- 

 million (Wright); Clark (Baird and Taylor); Jefferson (Barnes); 

 Putnam (MacDougal); Hamilton (Wilson); Fayette (Hessler); 

 Vigo (Blatchley); Kosciusko (Coulter); Steuben (Bradner). 



P. Persic aria L. Lady's Thumb. 



Frequent in waste places, usually in moist soils, in many parts 

 of the State. In many cases it has become an annoying weed 

 through its invasion of cultivated fields. 



Flowers from June until the frosts. 



Jay, Delaware, Randolph and Wayne (Phinney); Clark (Baird 

 and Taylor); Noble (Van Gorder); Jefferson (J. M. Coulter); 

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

 (Meyncke); Fayette (Hessler); Vigo (Blatchley); Steuben (Brad- 

 ner). 



P. Careyi Olney. 



In swamps and marshes in a few localities in the northern 

 counties. Nowhere abundant but not infrequent in the regions 

 mentioned. First reported by Mr. W. B. Van Gorder. 



Flowers in August and September. 



Noble (Van Gorder); Kosciusko (Coulter); Marion. 



P. hydropiperoides Michx. Mild Smartweed. 



In marshes and the shallow water of ponds and lakes and also 

 on muddy shores, in many counties of the State. Common where- 

 ever found. 



Flowers from June until September. 



Tippecanoe (Cunningham); Jay, Delaware, Randolph and 

 Wayne (Phinney); Jefferson (J. M. Coulter); Gibson and Posey 

 (Schneck); Franklin (Meyncke); Clark (Baird and Taylor); Noble 

 (Van Gorder); Vigo (Blatchley); Hamilton and Marion (Wilson); 

 Steuben (Bradner). 



