NPSpecies

Data Source: White and Pyne 2003

Native Range: Native to Europe, north Africa, and temperate Asia (Weber 2003).; 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: Pastures, disturbed areas, roadsides, hedge-rows; common. (Weakley 2007) In legacy NPSpecies Pest value was Yes with comment: Natureserve I-Rank: High/Medium. I-Rank Reasons Summary: Widespread in the U.S. Holcus lanatus is present in every state (including AK and HI), except WY, SD, NE, MN, and FL. Apparently, it causes more negative impacts in the western U.S. but more information is needed. Holcus lanatus forms dense swards that reduce native species richness and eliminate native grasses and forbs. Allelopathic activity is suspected. In Hawaii, it forms dense stands which shade out seedling establishment. Holcus lanatus occurs in disturbed areas but also in some communities of conservation significance. Holcus lanatus has become a major problem on western Oregon and Washington grassland preserves. Holcus lanatus was determined to be the fourth worst invasive plant threatening Garry oak and associated ecosystems in British Columbia; these communities occur from British Columbia south to California. In Hawaii, it is a common plant in a number of montane and subalpine communities, including wetlands and uplands. Elimination of the plant is difficult due to its perennial nature, its ability to regenerate from decumbent tillers even when cut to only 2 cm above the ground surface, and it enormous seed bank. More information is needed, especially about trends in distribution and abundance, and management difficulty.

Park Species Data Source: White and Pyne 2003