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At the end of our transect, on banks near the confluence of the Snake and Grand Ronde Rivers, we can observe riparian (river bank) communities. Riparian communities flood annually and are swampy seasonally. The wettest sites have water-loving and fast-growing cottonwoods (Populus) and willows (Salix), among which are growing herbaceous sedges and rushes. Where the rivers are caught by steep rocky banks, creating a dry environment for plants, we find net-leaved hackberry (Celtis reticulata). This hackberry is a small tree that is densely leafy, and its leaves feel rough. On these rocky banks with the net-leaved hackberry are hawthorns (Crataegus douglasii), mock oranges (Philadelphus lewisii), and serviceberries (Amelanchier alnifolia).
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