66103
Black poplar is an extremely unusual tree to be associated with notable events or traditions , which are more likely to involve pedunculate oak , sessile oak , common yew or hawthorn ( " Crataegus " ) .
 Crataegus
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:
 Crataegus