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Cynanchum louiseae , a species in the milkweed family , is also known as Black swallow-wort , Louise 's swallow-wort. , or Black dog-strangling vine , Cynanchum louiseae is a species of plant that is native to Europe and is found primarily in Italy , France , Portugal , and Spain .
 Europe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Europe