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In plants , allogamy is used specifically to mean the use of pollen from one plant to fertilize the flower of another plant and usually synonymous with the term " cross-fertilization " or " cross-pollination " ( outcrossing ) , though the latter term can be used more specifically to mean pollen exchange between different plant strains or even different plant species ( where the term " cross-hybridization " can be used ) rather than simply between different individuals .
 flower
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:
 flower