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DESCRIPTION:
Pacific poison-oak is a broadleaf perennial vine or shrub, sometimes treelike in form.
It is known for its milky, poisonous oil that can cause a severe skin rash. Cotyledons (seed leaves) are egg-shaped to oblong, short stalked and often slightly glossy. First leaves are opposite
to one another on the stem and consist of three leaflets. The terminal leaflet is lance-shaped and much longer than the
lateral football shaped leaves. The leaves turn bright red in the autumn.
It is
particularly troublesome in the dry sandy soils of the foothills and
dry-farmed mountain orchards. It reproduces from underground stems and from
seed.
See UC IPM's Poison Oak Pest Note for more information.
Broadleaf ID illustration.
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