© Robert Siegel
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Poison oak

Order: Sapindales
Family: Anacardiaceae (cashew, mango, poison oak, toxicodendron family)
Genus: Toxicodendron

Species on page - 2 species in 1 genus depicted

Poison oak (Toxicodendron diversilobum)
Poison ivy (Toxicodendron radicans)

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Poison oak (Toxicodendron diversilobum)

Leaves of three - poison distribution

poison oak
Toxicodendron diversilobum
October 26, 2013
Photographing Nature class

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Leaves of three

photographing nature hike

Poison Oak
Jasper Ridge
October 25, 2014

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Poison oak emerging

poison oak
San Bruno Mountain
March 2, 2013 with Photographing Nature

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The Stanford Quad

Toxic tenant in the quad

poison oak

Poison oak (Toxicodendron diversilobum)
April 18, 2014
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Poison berries

poison oak berries
Poison oak (Toxicodendron diversilobum)
Family: Anacardiaceae
Jasper Ridge
June 5, 2014

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Poison oak berries

jasper ridge

Poison oak (Toxicodendron diversilobum formerly Rhus diversiloba)
Family: Anacardiaceae
Order: Sapindales
Jasper Ridge
October 30, 2016
Northern California Science Writers Association (NCSWA) docent walk
Canon 7dmark2

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san bruno 2021
Poison oak (Toxicodendron diversilobum)
Family: Anacardiaceae
Firth Canyon trail
San Bruno Mountain
Nature Through Photography class trip
August 8, 2021
Canon 7D MarkII

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Año Nuevo

Doubly poisonous

amanita muscaria and poison oak
Amanita muscaria and poison oak
April 13, 2014

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Poison oak afflicted

jasper ridge

Poison oak (Toxicodenron diversiloba)
Jasper Ridge
October 14, 2017
with Photographing Nature class
Canon rebel T5i

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Jeff's itchin' to go

jasper ridge open house

Jasper Ridge Open House
May 12, 2018
Canon 5Dmark2

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Squirrel getting POed

monarch

Squirrel ( )
Poison oak (Toxicodenron diversiloba)
Family: Anacardiaceae (cashew, mango, poison oak, toxicodendron family)
Natural Bridges, Santa Cruz

October 26, 2018
Canon 7Dmark2

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stanford dish 2021

Poison oak (Toxicodendron diversilobum)
Family: Anacardiaceae (cashew, mango, poison oak, toxicodendron family)
Stanford Dish
September 28, 2021
Canon 7Dmark2

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Poison ivy (Toxicodendron radicans)

new jersey

Poison ivy (Toxicodendron radicans)
Family: Anacardiaceae (cashew, mango, poison oak, toxicodendron family)
The Great Swamp, New Jersey
October 6, 2021
Canon R5

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New York 2021

Poison ivy (Toxicodendron radicans)
Family: Anacardiaceae (cashew, mango, poison oak, toxicodendron family)
Mount Beacon, New York
October 13, 2021
Pixel 5

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Last modified: October 1, 2021
Created: October 30, 2013 (from cercocarpus.html)
Contact: siegelr@stanford.edu
All pictures are protected by copyright. Do not use without permission.