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45 <br />and ~_ ~:~°r'e5~k~~ c'l~~z^t~• No boulders occurred on <br />any of the transects. All coverages were absolute coverage. Total plant <br />coverage does not include overlapping species, and therefore the sum of <br />individual species coverage may exceed the total plant coverage. Vegetation <br />data are here combined into the following classes: horsetails (species of the <br />genus Equisetum), sedges and rushes (the families Cyperaceae and Juncaceae), <br />grasses (the family Gramineae), (orbs (all herbaceous broad-leaved Angiosperms), <br />and woody perennials. Coverage and density of three herbaceous genera, <br />Glycyrrhiza (licorice), Apocynum (dogbane), and Asclepias (milkweed), which <br />dominate much of the floodzone vegetation of the Yampa River, are presented <br />separately as well as being included in the fortis category. Within the category <br />of woody perennials, willows (Salix), cottonwoods, and tamarisk were treated <br />individually, and their seedlings were further distinguished in density <br />measurements. <br />Density values are given for fortis (including Glycyrrhiza, Apocynum, and <br />Asclepias, as well as listing them separately), willow, tamarisk, cottonwood, <br />and shrubs (not including willow or tamarisk). The densities of cottonwood and <br />tamarisk seedlings are given separately from those of mature plants <br />(non-seedlings). <br />A list of plant species identified from each site follows the data table <br />for that site. Species are listed according to the category in which they were <br />placed in the data table. A representative profile of each site also <br />accompanies the data tables. <br />The half-meter elevational zones are designated with Roman numerals, Zone I <br />being nearest the water. Islands and bars had multiple slopes, which were <br />