53980
It is naturalised in North America , being found in most of the United States , the greatest concentrations of the plant can be found in the north-central and northeastern sections of the country .
 North America, United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 North America, United States