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Identifying Poison Sumac
Poison sumac now bears the Latin name Toxicodendron vernix, replacing the older name, Rhus vernix. It is a shrub (some consider it a small tree) that grows in swampy areas, often next to Cinnamon ferns (Osmunda cinnamomea), marsh marigolds (Caltha palustris), cattails (Typha), and winterberry holly (Ilex verticillata). All parts of poison sumac are poisonous.
One key to proper identification is studying the shrub's individual plant parts:
- Leaf (color and shape)
- Stem (color)
You increase your odds of identification if you know what all of these plant parts look like, rather than knowing the appearance of just one.
A second key to successful identification is learning what the plant looks like from season to season. If you are familiar with the plant's appearance at only one particular time of the year, you may not recognize it when you encounter it during another season. In addition to the practical benefit of knowing what poison sumac looks like in fall, it is also simply enjoyable to view its fall foliage. Its autumn display is every bit as good as the more familiar ones we appreciate from the great fall color trees.Continue to 2 of 14 below.
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The edge, or margin, of poison sumac's leaflet is considered "entire" in plant-identification terminology, and it displays a midrib of a lighter color. A leaf margin that is entire is smooth: It lacks the "teeth" that the leaf edge of a Roger's flower (Rodgersia) has, for example.Continue to 3 of 14 below.
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Pinnately Compound Leaves
The shape of poison sumac leaves is described by botanists as "pinnately compound." Pinnate means resembling a feather; compound means that, instead of one, unified structure, a plant's leaf is really composed of multiple leaflets joined by stems.
Poison sumac has leaves made up of 5 to 13 leaflets. While the exact number varies, it is always an odd number. That's because, while most of the leaflets form matching pairs (one across from the other), there's always one lone leaflet at the tip of the compound leaf, which gives it the shape of a feather.Continue to 4 of 14 below.
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The stems of poison sumac leaves further help us to identify the plant. The bright red color of the stems is one of the first things you'd want to look for in the spring to distinguish the shrub from nonpoisonous varieties of sumac.Continue to 5 of 14 below.
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Spring and Summer Berries
The berries of poison sumac start out green in spring and remain that color for much of the summer. They grow in clusters that are quite distinct from the berry clusters of nonpoisonous sumacs (Rhus typhina, for example), in terms of color, shape, and texture.Continue to 6 of 14 below.
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Oddly Shaped Berries
One distinguishing feature of the berries of poison sumac is that they aren't perfectly round. Although toxic to the touch for humans, poison sumac berries are not toxic to birds. Many birds, including quail, treat the berries as an emergency food source in winter.Continue to 7 of 14 below.
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Fall BerriesContinue to 8 of 14 below.
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Orange Fall Foliage
The fall foliage of poison sumac is magnificent, especially because the leaves don't all turn the same color at the same time. This makes for some beautiful combinations. When all of the leaves finally do become the same color, that color can be orange, yellow, or red.Continue to 9 of 14 below.
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Yellow Fall Foliage
Poison sumac with yellow fall foliage can revival that of the birch trees.Continue to 10 of 14 below.
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Red Fall Foliage
The most striking single color poison sumac's fall foliage can become is red, which has a brightness and crispness that rivals the fall foliage of red maple trees, albeit on a smaller scale.Continue to 11 of 14 below.
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Mixed Fall Foliage
Lovers of variety will be most thrilled when the autumn leaves of poison sumac offer a number of colors all at once. Examples of possible color combinations include:
- Yellow and pink
- Red and pink
- Red, pink, and yellow
In all three cases, a tinge of green may remain to add yet another color.Continue to 12 of 14 below.
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Poison sumac is a multi-branched shrub that grows to be 6 to 20 feet high. The new bark on the branches is relatively smooth. If you learn how to identify the plant by its bark, then you will be able to avoid coming into contact with poison sumac in winter (after it has lost its leaves). You can get a rash from allowing your skin to brush up against poison sumac, even in winter.Continue to 13 of 14 below.
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One of poison sumac's nicknames is "poison dogwood." If the rash it causes can be considered its "bite," then, in the case of this dog, it is not true that its bark is worse than its bite. But the plant is not related to true dogwood (Cornus genus). The old bark of poison sumac is much rougher in texture than the newer bark.Continue to 14 of 14 below.
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A Harmless Relative
Most sumac shrubs are quite harmless (nonpoisonous) and potentially desirable landscaping elements, which is another reason why you should identify poison sumac properly: There is no reason to pass up the great fall color of nonpoisonous sumac simply because they have "sumac" in their common name.
One of the easiest ways to distinguish between the two is by examining the berries or seeds. Nonpoisonous sumac forms its seeds in a red, fuzzy seed-tuft that offers some ornamental value. This seed-tuft looks feathery from a distance and is soft to the touch. The seeds are tightly packed within the seed-tuft. Wild birds eat the seeds in winter.