HISTORIC ROAD: A public or private road that has been documented by historic surveys, and maintains its historic alignment and landscape context through views of natural features, historic landscape patterns, historic sites and structures, historic farmstead groupings, or rural villages and is identified as a historic road in the Approved Countywide Master Plan of Transportation.
HISTORIC SITE: As identified on the Prince George’s County Historic Sites and Districts Plan as a designated historic site or that is noted on the National Register of Historic Places.
INVASIVE SPECIES: A non-native plant that tends to escape containment and rapidly spreads in an area where there are few natural controls to its growth, resulting in a crowding out of native species or lessening of biological diversity. For purposes of this manual, invasive species are those identified in (1) Invasive Species of Concern in Maryland (as updated periodically by the Maryland Invasive Species Council), or (2) Plant Invaders of Mid-Atlantic Natural Areas, published by the National Park Service, U.S. Fish and Wildlife Service (as updated periodically).
NATIVE SPECIES: A plant historically present in a particular region. Native is usually defined as having been found indigenous to the local area before colonization. For purposes of this manual, native species are those as identified in the U.S. Fish and Wildlife Service Publication, Native Plants for Wildlife Habitat and Conservation Landscaping – Chesapeake Bay Watershed or the M-NCPPC publication, Native Plants of Prince George’s County.
ORNAMENTAL TREE: A deciduous tree planted primarily for its ornamental value. May be any size at maturity, but will tend to be smaller than a shade tree.
PARKWAY: A linear, landscaped park designed to encompass a roadway that is restricted to use by automobiles. Suitland Parkway and Baltimore-Washington Parkway are the two parkways located in Prince George’s County and are identified as such in the Approved Countywide Master Plan of Transportation.
PLANT UNIT: Plant unit equivalencies are as follows: One (1) shade tree = Ten (10) plant units One (1) evergreen tree = Five (5) plant units One (1) ornamental tree = Five (5) plant units One (1) shrub = One (1) plant unit
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