This list includes some common and less commonly found invasive species for this region, but is not all-compassing. Please visit to find additional species.

    Siberian Elm tree

    Siberian Elm:  Ulmus pulmila. This elm is distinguished by its small, elliptical, smooth, singly-toothed leaves, that reach lengths of 0.8-2.6 inches. They are tapering or rounded at their asymmetrical base. The alternate leaves are dark green and smooth above, paler and nearly hairless beneath. Foliage is slightly pubescent when young. Flowers are greenish, lack petals, and occur in small drooping clusters of 2-5 blossoms. The winged fruits are about 1/2-inch-wide and hang in clusters.

    Tree of heaven

    Tree-of-Heaven:  Ailanthus altissima. Originally from China; rapid growing tree to 80 feet tall; alternate, compound leaves, 10-40 leaflets with smooth margins on 1- to 3-foot stalks. Large terminal clusters of small yellowish-green flowers yield wing-shaped fruit on female trees. Forms thickets and dense stands.

    Salt Cedar

    Salt Cedar:  Tamarix spp. Salt cedars are characterized by slender branches and gray-green foliage. The bark of young branches is smooth and reddish-brown. As the plants age, the bark becomes brownish-purple, ridged and furrowed. Leaves are scale-like, about 1/16 inch long and overlap each other along the stem. They are often encrusted with salt secretions. From March to September, large numbers of pink to white flowers appear in dense masses on 2-inch long spikes at branch tips.

    Less common to see or less impactful:

    Russion olive_Invasive
    Russian olive:  Elaeagnus angustifolia. Can out compete native vegetation, interfere with natural plant succession and nutrient cycling, and tax water reserves. It can grow on bare, mineral substrates and dominate riparian vegetation where overstory cottonwoods have died. Found as scattered plants in forest openings, open forests, and along forest edges. Thrives in sandy floodplains. Shade intolerant. Spreads by bird- and other animal-dispersed seeds.

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    For detailed descriptions and more photos, see James H. Miller's publication "Nonnative Invasive Plants of Southern Forests" at