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Upper Amazon Creek <br /> Plant Communities: Existing Conditions & Guidelines for Tree and Shrub <br /> Plantings <br /> 1. Martin Street to Snell Avenue <br /> a) Existing Conditions <br /> This segment of the creek is vegetated with a diverse riparian forest. A lot of different tree and <br /> shrub species are in this part. Both banks are covered by plants, but the plantings end abruptly, <br /> not far beyond the top of the bank, where routine mowing occurs. <br /> ASH - COTTONWOOD - MAPLE RIPARIAN FOREST <br /> Canopy <br /> Dominant species <br /> • Acer macrophyllum Big -leaf maple <br /> • Fraxinus latifolia Oregon ash <br /> • Populus balsamifera Black cottonwood <br /> Associate species <br /> • Acer circinatum Vine maple <br /> • Alnus rhombifolia White alder <br /> • Alnus rubs Red alder <br /> • Calocedrus decurrens Incense -cedar <br /> • Pinus ponderosa Ponderosa pine <br /> • Pseudotsuga menziesii Douglas -fir <br /> • Quercus garryana Oregon white oak <br /> • Rhamnus purshiana Cascara <br /> • Salix lucida ssp. lasiandra Pacific willow <br /> c <br /> 7 <br />