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Common components of the herb layer in bogs includes the carnivorous plants : round-leaved sundew ( " Drosera rotundifolia " ) , and pitcher plant ( " Sarracenia purpurea " ) .
 Drosera rotundifolia, Sarracenia purpurea
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:
 Drosera rotundifolia, Sarracenia purpurea