alien, exotic, foreign, introduced: see non-native.

axil: the junction of leaf and stem.

biodiversity: the sum of all the plants, animals and other organisms living on Earth.

biological control: the use of living organisms — parasites, pathogens or predators — to control an invasive or other pest species.

cultivar: a race or variety of a plant that has been created or selected intentionally and maintained through cultivation.

girdle: to cut through the bark and growing layer (cambium) all around the trunk of a tree.

glyphosate: a type of systemic herbicide (e.g., Roundup® for non-wetland use, Rodeo® for wetlands or near water).

indigenous: see native.

invasive: a species that grows and spreads rapidly, establishes over large areas, and displaces native species.

native: a species that naturally occurs in a particular region, ecosystem and habitat. Species native to North America are generally recognized as those occurring on the continent prior to European settlement.

natural area: an area of land or water with predominantly native vegetation or natural geological features that is allowed to respond to the forces of nature with minimal human influence.

non-native: a species that, due to direct or indirect human activity, occurs in locations beyond its known historical or potential natural range. Refers to species from another continent, region, ecosystem, or habitat.

noxious weed: a legal designation used specifically for species that have been determined to be major pests of agricultural systems and are subject, by law, to certain restrictions.

pedicel: stalk that attaches individual flowers to the main stem of an inflorescence.

peduncle: stalk that supports an inflorescence.

pest: a plant, animal or other organism considered harmful.

rhizomes: underground stems.

sepals: bract-like or leaf-like structures below the petals of a flower.

stipules: a pair of leaf-like structures at the base of the leaf stalk on some plants.

stolons: above-ground stems.

systemic herbicide: an herbicide that is absorbed by a plant and carried throughout the tissues.

turions: vegetative buds formed in leaf axils or stem tips.

triclopyr: a type of systemic herbicide (e.g., Garlon®).

weed: a subjective word used to describe any plant growing wherever someone wishes it did not; can include native and non-native plants.

wildland: see natural area.

*Note: mention of a trade name does not constitute the endorsement of the product by authors, agencies or organizations involved in the production of this publication or website.


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Last updated:11-Nov-2010