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Upper Amazon Creek <br /> Woody Understory <br /> Dominant species <br /> • Crateagus douglasii Black hawthorn <br /> • Oemlaria cerasiformis Indian plum <br /> • Salix hookeriana Hooker's willow <br /> • Salix sitchensis Sitka willow <br /> • Symphoricarpos albus Snowberry <br /> Associate species <br /> • Amelanchier alnifolia Western serviceberry <br /> • Berberis aquifolium Tall Oregon grape <br /> • Cornus sericea Creek dogwood <br /> • Corylus cornuta var. california California hazel <br /> • Holodiscus discolor Oceanspray <br /> • Physocarpus capitatus Ninebark <br /> • Prunus emerginata var. mollis Bittercherry <br /> • Rosa gymnocarpa Baldhip rose <br /> • Rubus leucodermis Blackcap <br /> • Rubus ursinus Pacific dewberry <br /> • Toxicodendron diversiloba Poison oak <br /> b) Guidelines for Tree and Shrub Plantings <br /> This reach, from Martin Street to Snell Avenue does not include guidelines, since it is dominated <br /> by natives and already has a well - developed riparian forest. It may revegetate passively. This <br /> section should be monitored to assure that "passive revegetation" does not allow invasives, such <br /> as blackberry, to take over. <br /> 8 <br />