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<br /> 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 /> A void 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 /> <br />Exhibit F to Ordinance No. [1] <br /> <br />Page 20 <br />