Northern red-backed vole northern forest and shrubland habitats. They occur in every major forest type in central Alaska. Plant species commonly found in areas occupied by northern red-backed voles include black spruce ("Picea mariana"), white spruce ("P. glauca"), quaking aspen ("Populus tremuloides"), paper birch ("Betula papyrifera"), alder ("Alnus" spp.), willow ("Salix" spp.), mountain cranberry ("Vaccinium vitis-idaea"), blueberry and bilberry ("Vaccinium" spp.), bunchberry ("Cornus canadensis"), and a variety of grasses and forbs. Important fungi, mosses and lichens include truffle ("Endogone fascilulata"), Schreber's moss ("Pleurozium schreberi"), mountain fern moss ("Hylocomium splendens"), sphagnum ("Sphagnum" spp.), and lichens ("Cladonia and Peltigera" spp.). The breeding season of northern
Types of plant oils means of extracting essential oils. In this process, used, for example, to extract the onion, garlic, wintergreen and bitter almond essential oil, the plant material is macerated in warm water to release the volatile compounds in the plant. Types of plant oils Plant oils or vegetable oils are oils derived from plant sources, as opposed to animal fats or petroleum. There are three primary types of plant oil, differing both the means of extracting the relevant parts of the plant, and in the nature of the resulting oil: Vegetable fats and oils are what are most commonly called vegetable oils.