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University of Oregon North Campus Conditional Use Permit Project Riparian Assessment and Management Report 3.4.4Plant Species Observed in PSA MB&G recorded plant species, both native and invasive, within the PSA. Plant species were associated with either herbaceous, shrub, or tree strata. The most common species observed during the field effort are listed below in Table 4. A complete list of plants observed during the July 2017 field effort is included in Appendix C. These lists are not a complete inventory of the every plant species that occurs in the PSA and are presented to provide a general understanding of botanical conditions in the PSA. Table 4. Most common plant species documented within the PSA on July 25, 26, and 27, 2017. Common Name Scientific NameStrata Native or Invasive Bird's foot trefoil Lotus corniculatus Herbaceous Invasive Perennial pea Lathyrus latifolius Herbaceous Invasive Poison hemlock Conium maculatum Herbaceous Invasive Queen Anne's lace Daucus carota Herbaceous Invasive Reed canary grass Phalaris arundinacea Herbaceous Invasive Common snowberry Symphoricarpos albus Shrub Native English hawthorn Crataegus monogyna Shrub Invasive Himalayan blackberry Rubus armeniacus Shrub Invasive Sweetbriar Rosa eglanteria Shrub Invasive Bigleaf maple Acer macrophyllum Tree Native Black cottonwood Populus trichocarpa Tree Native Oregon ash Fraxinus latifolia Tree Native White alder Alnus rhombifolia Tree Native Pacific willow Salix lasiandra Tree Native The percentage of invasive plants was also documented at each riparian assessment point. Invasive vegetation strata were aggregated at each riparian assessment point to determine cumulative invasive species cover. The majority of riparian tree cover in each assessment point was from native species. As such, invasive species dominance at each assessment point is in the herbaceous and/or shrub strata. Aggregated invasive species coverage greater than 50% was recorded at approximately half of the riparian assessment points. Riparian assessment points with high percentages of aggregated invasive plant coverage (i.e., greater than 80%) were located mostly within the Millrace Slough and east of the Frohnmayer Bridge along the Willamette River. There were minor infestations of Japanese knotweed (Fallopia japonica) within the southern portion of the PSA and infestations of Scotch broom (Cytisus scoparius) along the Willamette River bank. Areas in the PSA that appear to be farthest from the disturbances discussed in this report had a lower percentage of invasive plant species with better composition of vegetation strata. Areas closer to trails and human disturbance were dominated by well-established patches of Himalayan blackberry, creating degraded habitat with single- layered vegetation structure. In addition, several homeless encampments were located in the blackberry thickets. These encampments were littered with refuse, which may attract invasive wildlife species to the area. These blackberry patches are shown in Figure 2, Appendix A. Percent cover of invasive plant species is shown on Figure 5, Appendix A. 4.0BASELINE FUNCTIONAL CONDITIONS Riparian functions contribute to maintaining water temperature and channel stability; providing flood storage and groundwater recharge; removing sediments; promoting nutrient cycling and aquatic food webs; and providing fish page 9