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However , root cuttings of thornless blackberries ( " Rubus fruticosus " ) will revert to thorny type because the adventitious shoot develops from a cell that is genetically thorny .
 Rubus fruticosus
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:
 Rubus fruticosus