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While the lower elevations are often covered in grasses and sagebrush , higher altitudes support Douglas fir , with several species of spruce , cottonwood and aspen being the dominant tree species .
 plant: sagebrush; plant: Douglas fir; plant: spruce; plant: aspen
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: sagebrush; plant: Douglas fir; plant: spruce; plant: aspen