poison-ivy Anacardiaceae Toxicodendron
radicans (L.) Kuntze
|Leaf: Alternate, trifoliate, 7 to 10 inches long, leaflets are ovate and irregularly toothed, shiny green above, paler below. TOXIC.
Flower: Species is monoecious; small, yellowish green, appearing in clusters, present late spring to early summer. TOXIC.
Fruit: Greenish white, round, 1/4 inch in diameter, borne in a hanging cluster, ripe in late summer and persist through winter. TOXIC.
Twig: Slender, gray- to red-brown, sparingly pubescent or glabrous, slender aerial roots present and older growth becomes densely covered and "hairy" in appearance; buds are stalked, naked, fuzzy brown, 1/4 inch long. TOXIC.
Bark: Dark gray, densely covered in aerial roots. TOXIC.
Form: May be present as a low (6 to 18 inches), spreading "carpet" on the forest floor, as a climbing vine, or as a bush.
Looks like: poison-oak
- Pacific poisonoak
- skunkbush sumac
- fragrant sumac
| Additional Range Information:
Toxicodendron radicans is native to North America.
Range may be expanded by planting.
See states reporting poison-ivy.
| External Links:
USDA Plants Database
|© Copyright 2016, Virginia Tech|
Dept. of Forest Resources
and Environmental Conservation,
all rights reserved.
Photos and text by: John Seiler,
Edward Jensen, Alex Niemiera,
and John Peterson