| To add to his challenges, Likes must deal with a high volume of brush such as thimbleberry, twinberry, elderberry, and fireweed. |
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| The understory in parts of the reserve is dense, consisting of willows, twinberry, devil's club, highbush cranberry, wild rose, and numerous annual plants. |
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| The floodplain of the Upper Adams contains wetland species of deciduous trees such as black cottonwood as well as a dense layer of shrubs including black twinberry, red-osier dogwood, and thimbleberry. |
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| Twinberry honeysuckle has pairs of tiny red-orange trumpet flowers tipped in yellow during spring and summer that are followed by black berries. |
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