192 Karl M. Wiegand and Arthur J. Eames 



Summit Marsh (£>.) ; marshes along Cayuga St., Ithaca (D.) ; Fall Creek, between 

 Forest Home and Varna (D. !) ; Crane Creek, Montezuma. (More common in 

 Cortland Co.) 



N. S. to Minn, and Calif., southw. to Fla. and Mex. ; less common on the Atlantic 

 Coastal Plain. 



In the Cayuga Lake Basin the plant passes insensibly to var. strigosum Small, with 

 strigose stems and leaves. A related species, P. setaceum Baldw., has been found in 

 Oswego Co. and should be sought on the Ontario plain in this flora. 



13. P. Persicaria L. Lady's Thumb. Heartweed. 



A weed of roadsides, waste places, and cultivated ground, but showing little relation 

 to type of soil though perhaps best developed in the richer loamy soils ; very common. 

 July-Sept. 



Throughout N. A., except in the extreme North. Naturalized from Eu. 



Dudley distinguished two additional forms : a smooth prostrate form, and a hairy 

 branched form with interrupted spikes. Specimens from Dudley in the Gray 

 Herbarium show that his first form was P. hydropiperoides Michx., var. strigosum 

 Small, and the second form was P. scabrum Moench. 



14. P. ORIENTALE L. PRINCE'S FEATHER. 



A weed on garbage dumps and sandy or gravelly waste places; occasional. Aug.- 

 Sept. 



City garbage dump along the lighthouse road, Ithaca; gravelly shore, s. w. corner of 

 Cayuga Lake ; near East Ithaca ; and possibly elsewhere. 



Escaped from cultivation. Native of India. 



15. P. virginianum L. 



Rich alluvial woodlands, chiefly in the valleys of the larger lakes ; frequent. Aug- 

 Sept. 



Spencer Lake; bank beyond Fleming Schoolhouse (D.) ; Negundo Woods (D.\) ; 

 Coy Glen; Beech Woods, Six Mile Creek; near Indian Spring (D.) ; Renwick 

 woods, and w. of the Inlet; Renwick slope (D.) ; McGowan Woods; along Fall 

 Creek, Ithaca to Etna; Freeville; Paine Creek; sand along Clyde River n. w. of 

 Marengo. 



N. H. to Ont. and Minn., southw. to Fla. and Tex. ; infrequent on the Coastal Plain. 



16. P. sagittatum L. Arrow-leaved Tearthumb. 



Low grounds, in somewhat mucky, sandy, calcareous or noncalcareous, soils ; very 

 common. Aug.-Sept. 



Newf. to Alberta, southw. to Fla. and Kans., including the Coastal Plain. 

 The flowers are either white or strongly tinged with purple. 



17. P. arifolium L. Halberd-leaved Tearthumb. 



Low woods, in rich black silty or sandy acid or neutral soils ; infrequent. Aug.- 

 Sept. 



Summit Marsh (D.) ; Headwaters Swamp; Slaterville Swamp; Jennings Pond; 

 Renwick woods and marshes (D.\) ; near Larch Meadow; Ringwood (D.\) ; Fir 

 Tree Swamp, Freeville; near Freeville (D.) ; McLean Bogs; Ledyard, 1827 (/. /. 

 Thomas) ; Cayuga Marshes (D. !) ; near Duck Lake; and elsewhere. 



N. B. to Ont., southw. to Ga., Ohio, and Mich., including the Coastal Plain. 



18. P. Convolvulus L. Black Bindweed. 



A weed of cultivated grounds and waste places, mostly in gravelly soils ; common. 

 July-Oct. 



Nearly throughout N. A., except in the extreme North. Naturalized from Eu. 



