informal
Poison oak is a reaction from the oil found in the plant.
May 21 I went out hiking and came back covered with poison oak.
One time I got somebody's poison oak to go away on the spot as a demonstration.
Work in dense poison oak will occur several days a week.
Poison Oak is also an important member of the native plant habitat community.
She says their cancers make hers look like poison oak.
He had got all puffed up from poison oak once, on a picnic.
Poison oak is widespread throughout the mountains and valleys of California.
There are actually four poisonous plants in this group, since poison oak has both a western and an eastern variation.
Western poison oak is extremely variable in growth habit and leaf appearance.
Wörterbuch der Botanik