Ranunculus <br />lesser <br />Highly invasive in Hendricks Park and Mt. Pisgah <br />1 <br />ficaria <br />celandine <br />Arboretum. Once established populations are <br />extremely difficult to control. <br />Ranunculus <br />creeping <br />This species is allelopathic. It forms large <br />1 <br />repens <br />buttercup <br />monocultures, especially in moist areas. It is common <br />in many of our parks including Tugman Park. <br />Robinia <br />black locust <br />Widely escaped east of Cascades, beginning to <br />113 <br />pseudoacacia <br />naturalize on West Side (Portland area, Benton <br />County, Lane County.) This species can form <br />woodland monocultures. <br />Rorippa <br />watercress <br />Chokes out small waterways on the valley floor. <br />l , 3 <br />nasturtium- <br />aquaticum <br />Rosa eglanteria <br />sweet -briar <br />This species easily invades prairie areas and is <br />1, 3 <br />common throughout town especially in West Eugene. <br />Rosa multijlora <br />multiflowered <br />This species, similar to R. eglantaria, is a common <br />1 <br />rose <br />problem in west Eugene wetlands and Fern Ridge <br />Wildlife Area. <br />Rubus <br />Himalaya or <br />One of the most widespread exotic species in the <br />1, 3, 4 <br />armeniacus <br />Armenian <br />Pacific Northwest. Populations are well established in <br />(discolor) <br />blackberry <br />all plant communities throughout Eugene. <br />Rubus <br />evergreen <br />Not as invasive as R. armeniacus, but still forms <br />l , 3 <br />laciniatus <br />blackberry <br />dense clumps. <br />Sorbus <br />European <br />Appearing in west Eugene wetlands and uplands. <br />193 <br />aucuparia <br />mountain -ash <br />Birds spread seed. <br />Ulex europeaus <br />gorse <br />A massive problem on the OR coast, now beginning <br />1 <br />to appear in the Willamette Valley. Extremely <br />difficult to remove. <br />Vinca major <br />periwinkle; <br />Mostly near old homesites -- they appear to spread <br />1 <br />vinca <br />vegetatively only. Completely dominates understories. <br />Vinca minor <br />periwinkle; <br />Mostly near old homesites -- they appear to spread <br />1, 3 <br />vinca <br />vegetatively only. Completely dominates understories. <br />Exhibit F to Ordinance No. 20351 Page 21 <br />