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Toxicodendron Diversilobum, or Western Poison-Oak
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Very Red
Here were three very red poison-oak leaves floating in front of a very deep green background.
Toxicodendron diversilobum Poison-Oak • Western poison-oak or Pacific poison-oak • Audubon Canyon Ranch Stinson Beach, California • (Photo posted Monday 10 October 2011) • (Photo taken in 2007) • © 2011 Bryan Costales #Ranch_10 Add a comment or report a mistake
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A Typical Tangle
A typical tangle of western poison-oak found alongside many wild trails in California. Absent trees to climb, it remains a tangled bush in form. Although most feared because of its red leaves, the green ones are equally irritating.
Toxicodendron diversilobum Poison-Oak • Western poison-oak or Pacific poison-oak • Oso Flaco Lake, Guadalupe, California • (Photo posted Monday 10 October 2011) • (photo taken 12:11:19 Tuesday 19 October 2010) • © 2011 Bryan Costales #BCY_1694 Add a comment or report a mistake
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Close Up Of Leaves
Up close, the leaf can be seen to resemble the leaf of an oak tree. Despite the resemblance, the poison-oak is not an oak at all, it just has similar leaves. That is why poison-oak is hyphenated, to distinguish it from poison oak.
Toxicodendron diversilobum Poison-Oak • Western poison-oak or Pacific poison-oak • Oso Flaco Lake, Guadalupe, California • (Photo posted Monday 10 October 2011) • (photo taken 12:11:53 Tuesday 19 October 2010) • © 2011 Bryan Costales #BCY_1695 Add a comment or report a mistake
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As A Vine
When a tree is present the poison-oak can climb just like ivy, but it is not an ivy.
Toxicodendron diversilobum Poison-Oak • Western poison-oak or Pacific poison-oak • Oso Flaco Lake, Guadalupe, California • (Photo posted Monday 10 October 2011) • (photo taken 13:33:56 Tuesday 19 October 2010) • © 2011 Bryan Costales #BCY_1769 Add a comment or report a mistake
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Both Forms
Here is a bush of poison-oak growing near or around the trunk of a tree. Just as if it were ivy, some of the stems have already begun to climb the tree.
Toxicodendron diversilobum Poison-Oak • Western poison-oak or Pacific poison-oak • Oso Flaco Lake, Guadalupe, California • (Photo posted Monday 10 October 2011) • (photo taken 13:35:44 Tuesday 19 October 2010) • © 2011 Bryan Costales #BCY_1771 Add a comment or report a mistake
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