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| The sumac family is characterized by
shrubs, small trees, or woody vines, with resin ducts in the bark and/or
the foliage. The leaves are simple or odd-pinnately compound, trifoliate,
alternate, and deciduous or evergreen. The fruit of these plants
is a drupe.
Caution! The sap from the plants of the Toxicodendron genus is poisonous to susceptible individuals upon contact as are the fumes from burning parts. |
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| Toxicodendron radicans
poison-ivy |
| Habit
Poison-ivy is a trailing shrub or a climbing vine if support is available. When climbing, it attaches to the supporting implement with numerous aerial roots from the stem. The main stems on trees often attain a diameter of 6-8 cm (2-3 inches). Leaves Leaves are compound, alternate, and deciduous. They are trifoliate,
with the petioles about the same length as the leaf blades. The leaves
are smooth with a varying amount of pubescence. The leaf blades are
ovate (oval, coming to a point). Leaf margins are entire (no serrations),
with one or more irregular lobes or coarse teeth. Leaflets can be
up to 6 inches in length and about 3 inches wide.
Poison-ivy is found in terrestrial habitats throughout North America
and Asia.
 Query
the USDA Plant Database |
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| Toxicodendron toxicarium
poison-oak |
| Habit
The characteristics of poison-oak are similar to those of poison ivy.
Poison oak is a trailing shrub which reproduces by underground runners.
The stems of this plant are stiffly erect, a little under 1/4 of an inch
in diameter.
Leaves are compound, alternate, and deciduous. They are trifoliate, with the petioles about the same length as the leaf blades. The leaves are smooth with a varying amount of pubescence. The leaf blades are more deeply lobed than those of poison-ivy, with 1-3 lobes on a side. The toothing and lobing of the leaflets of poison-oak are notably oak-like. The lower surface of the leaflets are more densely pubescent, sometimes mainly along the major veins. Caution! The sap from the plants of the Toxicodendron genus is poisonous to susceptible individuals upon contact as are the fumes from burning parts. Flowers
Poison-oak is found in dry upland habitats of various mixtures: longleaf
pine-scrub oak ridges and hills, open pine-hardwood second-growth woodlands,
open banks of highways and railways. This plant occurs throughout
North America and Asia.
Query
the USDA Plant Database |
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| Toxicodendron vernix
poison sumac |
| Habit
Poison sumac is a deciduous shrub or small slender tree that can grow
to about 20 feet in height.
Leaves are odd-pinnately compound, alternate, and deciduous. Each
leaf contains 7 to 15 leaflets which are 2-4 inches in length. The
margins of the leaflets are entire (no serrations).
Poison sumac is found in bogs, seepage slopes, evergreen shrub-tree
bogs or bays, depressions in pine flatwoods, swamps, and wet woodlands
and thickets. This plant is found throughout the eastern United States.
Query
the USDA Plant Database |
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