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Many herbs with primarily northern distributions occur here , including oak fern , pod grass ( collected in 1909 ) , Canada mayflower , mountain bindweed , marsh marigold , goldthread , swamp saxifrage , white wood sorrel , northern white violet , Jacob 's ladder and buckbean .
 oak fern, pod grass, Canada mayflower, mountain bindweed, marsh marigold, swamp saxifrage, white wood sorrel, northern white violet, Jacob 's ladder, buckbean
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:
 oak fern, pod grass, Canada mayflower, mountain bindweed, marsh marigold, swamp saxifrage, white wood sorrel, northern white violet, Jacob 's ladder, buckbean