NPSpecies

Data Source: White and Pyne 2003

Native Range: Native to Europe (Whitson 1996).; Data Source: http://plants.usda.gov, 10 August 2007 Legacy NPSpecies information may no longer be applicable, please remove if it is not applicable. In legacy NPSpecies Weedy value was Yes with comment: Fields, roadsides, disturbed areas; common. (Weakley 2007) In legacy NPSpecies Pest value was Yes with comment: Natureserve I-Rank: Medium/Insignificant. I-Rank Reasons Summary: Poa annua occurs in every U.S. state and is apparently widespread within each state. Poa annua is often a lawn and garden weed and is also characteristic of unstable and disturbed situations (Hutchinson and Seymour 1982). In addition to manicured areas it also occurs on roadsides, waste ground, trails in woods, clearings, shores, and stream banks. In Kentucky, it is listed as a lesser threat which is defined as an exotic plant species that seems to principally spread and remain in disturbed corridors and does not readily invade natural areas. Poa annua occurs in Indiana Dunes National Lakeshore, Grand Canyon National Park,and Channel Islands National Park. In Grand Canyon National Park, it occurs in areas that have been disturbed within the last 10 years, is associated with early successional species, and shows little or no invasion of native communities. It is not considered to be a strong competitor with established plants. Apparently its impacts on native species are low but more information is needed.

Park Species Data Source: White and Pyne 2003