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The dominant tree in the south is usually the black oak ( " Quercus velutina " ) , although the chinquapin oak " ( Quercus muhlenbergii ) " , post oak ( " Quercus stellata " ) , and black-jack oak ( " Quercus marilandica " ) are also common .
 tree, black oak
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 tree, black oak