Ecosystem – A system of plants, animals, and microorganisms interacting with their environment of soil, water, and climate.
Endangered species – A plant or animal that is in danger of going extinct throughout all or part of its range.
Environment – The prevailing conditions of climate, soil, topography, and biological (other plants and animals) factors in an area.
Epicormic branch – A branch that develops by chance or from a dormant bud beneath the bark in an unusual location, usually on hardwood tree stems and major limbs. It typically arises after a stand has been heavily thinned, apparently in response to additional sunlight. Also called “water sprout.”
Even-aged stand – A stand in which the age difference between trees forming the main canopy does not exceed 20 percent of the age of the stand at maturity.
Evergreen tree – A tree that retains some or all of its leaves throughout the entire year, for example, red pine, white spruce, white-cedar.