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These woods are also home to some deciduous trees such as rowan , silver and downy birches ( " Betula pendula " and " Betula pubescens " ) and willows ( " Salix spec. " ) .
 Betula, Betula, Salix spec.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Betula, Betula, Salix spec.