RanunculuslesserHighly invasive in Hendricks Park and Mt. Pisgah 1 <br />celandine Arboretum. Once established populations are <br />ficaria <br />extremely difficult to control. <br />Ranunculuscreeping This species is allelopathic. It forms large 1 <br />monocultures, especially in moist areas. It is common <br />repensbuttercup <br />in many of our parks including Tugman Park. <br />Robiniablack locust Widely escaped east of Cascades, beginning to 1, 3 <br />pseudoacacianaturalize on West Side (Portland area, Benton <br />County, Lane County.) This species can form <br />woodland monocultures. <br />Rorippawatercress Chokes out small waterways on the valley floor. 1, 3 <br />nasturtium- <br />aquaticum <br />Rosa eglanteria sweet-briar This species easily invades prairie areas and is 1, 3 <br />common throughout town especially in West Eugene. <br />Rosa multiflora multiflowered This species, similar to R. eglantaria, is a common 1 <br />roseproblem in west Eugene wetlands and Fern Ridge <br />Wildlife Area. <br />RubusHimalaya or One of the most widespread exotic species in the 1, 3, 4 <br />armeniacusArmenian Pacific Northwest. Populations are well established in <br />(discolor) blackberryall plant communities throughout Eugene. <br />RubusevergreenNot as invasive as R. armeniacus, but still forms 1, 3 <br />laciniatusblackberrydense clumps. <br />SorbusEuropeanAppearing in west Eugene wetlands and uplands. 1, 3 <br />aucupariamountain-ashBirds spread seed. <br />gorse A massive problem on the OR coast, now beginning 1 <br />Ulex europeaus <br />to appear in the Willamette Valley. Extremely <br />difficult to remove. <br />periwinkle;Mostly near old homesites -- they appear to spread 1 <br />Vinca major <br />vincavegetatively only. Completely dominates understories. <br />Vinca minor periwinkle;Mostly near old homesites -- they appear to spread 1, 3 <br />vincavegetatively only. Completely dominates understories. <br />Exhibit F to Ordinance No. 20351 Page <br />21 <br /> <br />