throughout Eugene. It permanently and dramatically <br />effects ecosystems where it has become established. <br />This species is still sold commercially. <br />Polygonum Japanese This species forms riparian monocultures. This 1, 2, 3 <br />cuspidatum (and knotweed species is not yet common in Eugene but populations <br />related species are becoming more common and larger. It is already a <br />and hybrids) significant problem in the Portland and Seattle areas. <br />Avoid all the large knotweeds. <br />Populus alba white poplar This species spreads rapidly via suckers and is 3 <br />difficult to remove once established. It also quickly <br />becomes a hazard tree as the brittle branches are <br />prone to breakage. This species is found is several <br />City parks including Alton Baker Park. <br />Prunus avium sweet cherry This species is spread by birds into forested areas and 1, 3, 4 <br />is a quite common understory invader in forested <br />areas throughout Eugene. <br />Prunus thundercloud Grafted species and rootstocks that sucker and flower, 1 <br />cerasifera plum produce fruit which is spread easily by birds. This <br />species is appearing in prairie areas in West Eugene <br />and woodland edges throughout town. <br />Prunus plum Not as invasive as P. avium. 1 <br />domestica <br />Prunus English laurel This common hedge evergreen is spread by birds and 1,3 <br />laurocerasus appears regularly in forested understories, especially <br />at Skinner Butte, Morse Ranch, and Hendricks Park. <br />Prunus Portugal laurel Similar to P. laurocrasus, this species appears 1 <br />lusitanica regularly in forest understories. <br />Prunus mahaleb mahaleb cherry Birds spread seeds of this species, which is common 3 <br />in the understories of forested areas and woodland <br />edges throughout town. <br />Pueraria kudzu While populations have not been found in Eugene, 1, 2, 4 <br />montana var. two occurrences have been noted in the Willamette <br />lobata Valley. This species has devastated plant communities <br />in southern and eastern states. <br />Pyracantha spp. fire thorn Birds eat fruits and spread plants into prairies. P. 1 <br />angustifolia, P. coccinea, et al. <br />Pyrus communis pear This species appears occasionally in prairie areas and 5 <br />shrub/scrub communities throughout town. <br />Exhibit F to Ordinance No. 20351 Page 20 <br />