Species are listed by scientific name.
An asterisk indicates a non-native species.
|Wild Cucumber||Echinocystis lobata|
|Wild Honeysuckle||Lonicera dioica|
|Poison Ivy||Rhus radicans|
|Carrion Flower||Smilax lasionuera|
|Riverbank Grape||Vitis riparia|
|Forest Grape||Vitis vulpine|
Poison Ivy (Toxicodendron radicans) is identified by small hairs that attach to tree trunk or other host surface. This plant grows throughout the North America, Japan, Taiwan, China and Russia. Poison ivy can survive in different types of habitat, though it usually lives in temperate forests that provide enough sunlight. In a bush form, Poison ivy rarely grows over a foot, but as a vine it can reach substantial lengths. Leaves are light green on young plants, dark green on old plants, red in autumn, and drop in winter. The leaves grow in clusters of three leaflets, which are often notched on young plants. Its yellow or greenish-white flowers bloom May- June. The irritating properties of Poison ivy are a result of the Urushiol oil found in the roots, stems, and leaves of the plant.
Wild grape (Vitis spp.) are common throughout Severson Dells Forest Preserve. Three species (Vitis aestivalis, Vitis riparia, and Vitis labrusca) are present with only small variation, so a general genus description is provided here. Buds usually appear in March to May, followed by flowers forty to eighty days after bud break. The non-showy flowers develop into grapes by late summer to early fall, which are edible when purple. Its large leaves are palmately lobed, or maple-like in shape, and are often opposed by a tendril used to help the plant sprawl or climb. Because of the climbing nature of Wild grapes, their size is highly variable. At Severson Dells, we often see Grapes sprawling over trees or bushes alongside the trail.