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Graminoid An herbaceous plant with linear, "grasslike" leaves that typically are oriented <br />vertically. Graminoids include grasses, sedges, and rushes. <br />Greenway or Greenway Corridor A linear open space area, usually composed of natural <br />vegetation, or vegetation that is more natural than surrounding land uses. May include paths or <br />recreational trails. <br />Ground layer A vegetation layer, mostly less that 3 feet tall, of grasses, forbs, and woody <br />plants. <br />Ground moraine A broad and level or gently undulating landform composed of material that <br />was deposited underneath, and sometimes at the margin of a glacier as the ice sheet melted; <br />also referred to as a till plain. <br />Grove A general term for a patch of trees less than 2 acres in area. <br />Grub A tree or shrub whose aboveground shoots are repeatedly killed by fire or browsing but <br />whose root system survives and continues to send up new shoots. The root system of a grub <br />may be several hundred years old; the above ground shoots are generally much younger. <br />Habitat The locality, site, and particular type of local environment in which plants, animals, and <br />other organisms live. <br />Herb A plant lacking a persistent above ground woody stem. Herbs include broad-leaved <br />flowering plants, ferns, grasses, sedges, and others. <br />High Water Level (HWL) The peak water surface elevation in a ponding area as a result of a <br />specific runoff event. Once the peak is reached, the pond water elevation eventually returns to <br />its normal (standing) water level. <br />Hydrology The science and study of water in nature, including its circulation, distribution, and <br />its interaction with the environment. <br />Hydrophyte A plant adapted to growing in water or on wet soils that are periodically saturated <br />and deficient in oxygen. <br />Hypolimnion Lower cooler layer of a lake during thermal stratification. <br />Ice block lake A lake that occurs in a depression that was formed when a block of glacial ice <br />was buried or surrounded by till or outwash sand, and then melted. <br />Ice scar A scar on a floodplain tree caused by abrasion by ice floes during spring flooding. <br />Impervious Surface A surface that is impermeable to the downward seepage of water; e.g., <br />pavement and roof tops. <br />Inflorescence An arrangement of flowers on a plant, such as in a cluster or along a stalk. <br />Lacustrine Refers to features (such as sediments, landforms, plant communities, or animal <br />communities) that were formed by or are associated with a lake. <br />Landform A land feature, such as plain, plateau, or valley, formed by a particular geologic <br />process. <br />Life form Characteristic structural features and growth pattern of plant species (e.g., broad- <br />leaved deciduous shrub). <br />Litter layer Relatively undecomposed organic matter and debris on top of soil layer. <br />Loading The amount of a pollutant or other substance delivered to a lake, usually expressed <br />as a weight per unit time (i.e. pounds per year). The loading of a given constituent to a receiving <br />water is a function of the volume of incoming water and the concentration of the constituent in <br />the incoming water. <br />Loess Fine material consisting predominantly of silt with fine sand and clay. Loess is often <br />deposited by wind. <br />Macrophytes Higher plants which grow in water, either submerged, emergent, or floating. <br />Reeds and cattails are examples of emergent macrophytes. <br />Marsh A plant community of shallow wetland basins, dominated by herbaceous, emergent <br />aquatic plants such as cattails and bulrushes. Marshes usually have standing water throughout <br />the growing season. <br />Meltwater Water released by melting glacial ice. <br />Mesic A general term describing upland habitats that are intermediate between wet and dry; <br />Top of the World Park Addition Natural Area Management Plan 3 <br />