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The most common trees that invade bogs as they fill in are black spruce ( " Picea mariana " ) , northern white cedar ( " Thuja occidentalis " ) , larch ( " Larix laricina " ) and black ash ( " Fraxinus nigra " ) .
 plant: Picea mariana; plant: Thuja occidentalis; plant: Larix laricina; plant: Fraxinus nigra
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: Picea mariana, Thuja occidentalis, Larix laricina, Fraxinus nigra 
Answer:
 plant: Picea mariana; plant: Thuja occidentalis; plant: Larix laricina; plant: Fraxinus nigra