© Robert Siegel
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Poison oak

Order: Sapindales
Family: Anacardiaceae
Genus: Toxicodendron

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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
 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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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)
Natural Bridges, Santa Cruz
October 26, 2018
Canon 7Dmark2

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modified: October 31, 2018 - Happy Halloween
created: October 30, 2013 (from cercocarpus.html)
Contact: siegelr@stanford.edu
All pictures are protected by copyright. Do not use without permission.