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He boiled the needles of the arbor vitae tree ( eastern white cedar ) to make a tea that was later shown to contain 50 " mg of vitamin C per 100 " grams .
 plant: arbor vitae
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 plant: arbor vitae