273] FLORA OF COLUMBIA AND VICINITY 13! 



Wet flats along streams; frequent. 

 Vermont to Minnesota; Florida to Texas. 



347. P. lapatMfolium L. ^Persicaria lapathifolia (L.) S. F. 

 Gray]. 



Waste and low places; common. 

 North America, Europe and Asia. 



348. P. nodosum Pers. \P. lapathifolium nodosum (Pers.) 

 Small]. 



Wet grounds, where it grows to a great size. 

 Almost cosmopolitan. 



349. P. orientale L. [^Persicaria orientalis (L.) Vilm.]. 

 Prince's feather. 



Adventitious in yards and waste places. 

 India, thence to Australia, South Africa and North 

 America. 



350. P. Virginianum L. \Tovara Virginiana (L.) Adans.]. 

 Virginia knotweed. 



Alluvial bottoms and wooded swamps; common in shade. 

 Nova Scotia to Minnesota and Nebraska; Florida to 

 Texas. 



351. P. sagittatum L. \Tracaulon sagittatum {L!) 'im?i\X\. 

 Tear-thumb. 



Along ditches and small streams and in swamps and 

 swales; local, but abundant where found. 



Newfoundland to Saskatchewan; Florida to Texas: 

 Asia. 



352. P. Convolvulus L. \^Tiniaria Convolvulus {'L.)'WGhh. 

 & Moq.]. Black bindweed. Wild buckwheat. 



Cornfields and waste places; infrequent except at Roche- 

 port. 



Europe and Asia, thence to North America. 



353. P. scandens L. [P dumetorum scandens (L.) Gray: 

 Tiniaria scandens (L.) Small]. Climbing false buck- 

 wheat. 



Woods and thickets and about cliffs and houses; common 

 and variable in the character of the calyx wings, some forms 



