 Fall colors of poison ivy on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, November 8, 2019
 False garlic (crow poison, Nothoscordum bivalve) taken from a lawn in Wolf Pen Creek Park. College Station, Texas, March 4, 2018
 Poison ivy in south-western part of Lincoln Woods State Park. Providence, Rhode Island, October 10, 2004
 Red and yellow leaves of poison ivy in Delaware and Raritan Canal State Park near Carnegie Lake. Princeton, New Jersey, May 8, 2007
 Flowers of false garlic (crow poison, Nothoscordum bivalve) in Lick Creek Park. College Station, Texas, March 27, 2008
 Poison pie mushrooms (Hebeloma crustuliniforme)(?) in moss in Sosnovka Park. Saint Petersburg, Russia, September 6, 2016
 Fall colors of poison ivy in Simmons Mill Pond Management Area south from Adamsville. Little Compton, Rhode Island, October 6, 2004
 A sprout of poison ivy, in Delaware and Raritan Canal State Park, near Harrison Street crossing. Princeton, New Jersey, May 1, 2007
 Blooming false garlic (crow poison, Nothoscordum bivalve) in Lick Creek Park. College Station, Texas, March 27, 2008
 Multicolored sprout of poison ivy in Delaware and Raritan Canal State Park near Carnegie Lake. Princeton, New Jersey, May 8, 2007
 Flower of Death camas (Poison onion, Zigadenus nuttallii) along South Meyersville Road near FM 1155 S., north from Chappell Hill, Texas. April 7, 2010.
 Poison ivy in Dighton Rock State Park, Massachusetts, May 10, 2003
 Red and yellow sprout of poison ivy in Delaware and Raritan Canal State Park near Carnegie Lake. Princeton, New Jersey, May 8, 2007
 Fall colors of poison ivy in south-western part of Lincoln Woods State Park. Providence, Rhode Island, October 10, 2004
 A sprout of poison ivy on a tree, in Delaware and Raritan Canal State Park, near Harrison Street crossing. Princeton, New Jersey, May 2, 2007
 Young leaves of poison ivy over Delaware and Raritan Canal, near Carnegie Lake. Kingston, New Jersey, May 10, 2007
 False garlic (crow poison, Nothoscordum bivalve) on a lawn in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, February 25, 2009
 Close up of flower of Death camas (Poison onion, Zigadenus nuttallii) along South Meyersville Road near FM 1155 S., north from Chappell Hill, Texas. April 7, 2010.
 Emerging young leaves of poison ivy, in Delaware and Raritan Canal State Park, near Carnegie Lake. Princeton, New Jersey, May 2, 2007
 Emerging poison ivy, in Delaware and Raritan Canal State Park, near Carnegie Lake. Kingston, New Jersey, May 4, 2007
 Colored young leaves of poison ivy in Delaware and Raritan Canal State Park near Carnegie Lake. Princeton, New Jersey, May 8, 2007
 Fall colors of poison ivy in south-western part of Lincoln Woods State Park. Providence, Rhode Island, October 10, 2004
 Leaves of poison ivy, in Delaware and Raritan Canal State Park, near Harrison Street crossing. Princeton, New Jersey, May 1, 2007
 Young leaf of poison ivy in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 15, 2009
 Poison ivy in Delaware and Raritan Canal State Park, near Harrison Street crossing. Princeton, New Jersey, May 1, 2007
 Poison Ivy in Delaware and Raritan Canal State Park, near Carnegie Lake. Kingston, New Jersey, May 4, 2007
 Colored offshoots of poison ivy in Delaware and Raritan Canal State Park near Carnegie Lake. Princeton, New Jersey, May 8, 2007
 Early fall color of poison ivy in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 30, 2008
 Shoot of poison ivy in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 9, 2009
 Poison ivy with budding flowers, in Delaware and Raritan Canal State Park, near Harrison Street crossing. Princeton, New Jersey, May 1, 2007
 Emerging leaves of poison ivy, in Delaware and Raritan Canal State Park, near Carnegie Lake. Princeton, New Jersey, May 2, 2007
 Berries of poison ivy in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 1, 2009
 Poison ivy, in Delaware and Raritan Canal State Park, near Harrison Street crossing. Princeton, New Jersey, May 1, 2007
 Poison ivy with budding flowers, in Delaware and Raritan Canal State Park, near Carnegie Lake. Princeton, New Jersey, May 5, 2007
 Poison ivy on a bark of a tree in Delaware and Raritan Canal State Park. Kingston, New Jersey, May 7, 2007
 Dying poison ivy in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 6, 2011
 Offshoot of poison ivy, in Delaware and Raritan Canal State Park, near Harrison Street crossing. Princeton, New Jersey, May 1, 2007
 A flowering bush and poison ivy over Delaware and Raritan Canal, near Carnegie Lake. Kingston, New Jersey, May 10, 2007
 Young leaves of poison ivy in Lemontree Park. College Station, Texas, March 24, 2010.
 Poison ivy in Sandcatcher park in Cape Cod. Sandwich, Massachusetts, May 18, 2003
 Poison ivy in Delaware and Raritan Canal State Park, near Harrison Street crossing. Princeton, New Jersey, May 1, 2007
 Poison ivy with background of Delaware and Raritan Canal, near Harrison Street crossing. Princeton, New Jersey, May 1, 2007
 Poison ivy on bark of a tree, in Delaware and Raritan Canal State Park, near Harrison Street crossing. Princeton, New Jersey, May 1, 2007
 Emerging poison ivy, in Delaware and Raritan Canal State Park, near Carnegie Lake. Princeton, New Jersey, May 2, 2007
 Sprouting poison ivy, in Delaware and Raritan Canal State Park, near Washington Road bridge. Princeton, New Jersey, May 3, 2007
 Sprouting poison ivy, in Delaware and Raritan Canal State Park, near Carnegie Lake. Princeton, New Jersey, May 5, 2007
 Young leaf of poison ivy in Delaware and Raritan Canal State Park near Carnegie Lake. Princeton, New Jersey, May 8, 2007
 Poison pie mushrooms (Hebeloma crustuliniforme)(?) in moss near Kavgolovo Lake, north from Saint Petersburg. Russia, September 5, 2016
 Poison ivy bushes on dunes of Town Neck Beach in Cape Cod. Sandwich, Massachusetts, May 18, 2003
 Young leaves of poison ivy, in Delaware and Raritan Canal State Park, near Carnegie Lake. Princeton, New Jersey, May 5, 2007
 Berries of poison ivy in Washington-on-the-Brazos State Historic Site. Washington, Texas, August 3, 2008
 Climbing poison ivy near Iron Bridge Trail in Lick Creek Park. College Station, Texas, November 27, 2008
 Blooming poison ivy in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 1, 2010
 Poison ivy in Sandcatcher park in Cape Cod. Sandwich, Massachusetts, May 18, 2003
 Red foliage of poison ivy near Lick Creek near Iron Bridge Trail in Lick Creek Park. College Station, Texas, November 27, 2008
 Poison ivy near Old Washington Town Site Loop Trail in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 22, 2009
 Green berries of poison ivy on Loop Trail in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 16, 2009
 Yellow foliage of poison ivy under power lines in Lake Bryan Park. Bryan, Texas, July 16, 2013
 Sprouting poison ivy on a tree, in Delaware and Raritan Canal State Park, near Carnegie Lake. Princeton, New Jersey, May 2, 2007
 Greenbrier and poison ivy on trees in Ross Hills Park, 6 miles west from Lafayette, Indiana, September 25, 1999.
 Poison ivy shooting over Lake Carnegie, in Delaware and Raritan Canal State Park. Princeton, New Jersey, May 5, 2007
 Fall colors of poison ivy in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 23, 2009
 Young leaves of poison ivy on a tree, in Delaware and Raritan Canal State Park, near Carnegie Lake. Princeton, New Jersey, May 2, 2007
 Back lit leaf of poison ivy in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 27, 2012
 Poison ivy in Washington-on-the-Brazos State Historic Site. Washington, Texas, June 23, 2012
 Yellow leaves of poison ivy in Lick Creek Park. College Station, Texas, July 7, 2012
 Poison pie mushrooms (Hebeloma crustuliniforme)(?) in moss near Kavgolovo Lake, north from Saint Petersburg. Russia, September 5, 2016
 Poison pie mushrooms (Hebeloma crustuliniforme)(?) near Lisiy Nos, west from Saint Petersburg. Russia, September 1, 2018
 Eastern poison ivy (Toxicodendron radicans) in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, March 10, 2019
 Shoot of poison ivy (Toxicodendron radicans) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville. Texas, March 16, 2019
 Eastern poison ivy (Toxicodendron radicans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Shoot of eastern poison ivy (Toxicodendron radicans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Young leaves of eastern poison ivy (Toxicodendron radicans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Eastern poison ivy (Toxicodendron radicans) in Wolf Pen Creek Park. College Station, Texas, March 24, 2019
 Shoots of eastern poison ivy (Toxicodendron radicans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 27, 2019
 Eastern poison ivy (Toxicodendron radicans) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest near Huntsville. Texas, March 30, 2019
 Flowers of poison ivy (Toxicodendron radicans) in Wolf Pen Creek Park. College Station, Texas, May 1, 2019
 Poison ivy leaf gall mite (irregular, wart-like light green to reddish-green bladder galls) in Bee Creek Park. College Station, Texas, June 10, 2019
 Yellowish-green and brilliant red wart-like galls on leaf surfaces of poison ivy in Bee Creek Park. College Station, Texas, June 10, 2019
 Puckered, irregular, wart-like galls on leaf surfaces of poison ivy produced by the eriophyid mite Aculops rhois (A. toxicophagus) in Bee Creek Park. College Station, Texas, June 10, 2019
 Irregular, wart-like light green to reddish-green bladder galls on leaf surfaces of poison ivy produced by leaf gall mite Aculops toxicophagus in Bee Creek Park. College Station, Texas, June 10, 2019
 Eastern poison ivy (Toxicodendron radicans) in Wolf Pen Creek Park. College Station, Texas, March 19, 2020
 Eastern poison ivy (Toxicodendron radicans) in Wolf Pen Creek Park. College Station, Texas, April 19, 2020
 Blooming eastern poison ivy (Toxicodendron radicans) in Wolf Pen Creek Park. College Station, Texas, April 19, 2020
 Virginia creeper and poison ivy in Wolf Pen Creek Park. College Station, Texas, April 19, 2020
 Leaves of eastern poison ivy (Toxicodendron radicans) in Wolf Pen Creek Park. College Station, Texas, April 19, 2020
 Green leaves of eastern poison ivy (Toxicodendron radicans) in Wolf Pen Creek Park. College Station, Texas, April 19, 2020
 Group of poison pie mushrooms (Hebeloma crustuliniforme)(?) near Lisiy Nos, west from Saint Petersburg. Russia, September 1, 2018
 Young plants of eastern poison ivy (Toxicodendron radicans) on Four Notch Loop Trail of Sam Houston National Forest near Huntsville. Texas, March 23, 2019
 Seedling of Eastern poison ivy (Toxicodendron radicans) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest near Huntsville. Texas, March 30, 2019
 Reddish-green bladder galls on upper leaf surfaces of poison ivy produced by the eriophyid mite, Aculops rhois (A. toxicophagus, family Eriophyidae) in Bee Creek Park. College Station, Texas, June 10, 2019
 Eastern poison ivy (Toxicodendron radicans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 13, 2020
 Young leaves of eastern poison ivy (Toxicodendron radicans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 13, 2020
 Back lit leaf of eastern poison ivy (Toxicodendron radicans) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 13, 2020
 Fall colors of poison ivy in Lick Creek Park. College Station, Texas, November 10, 2020
 Fall colors of poison oak in Wolf Pen Creek Park. College Station, Texas, December 13, 2020
 Poison pie mushrooms (Hebeloma crustuliniforme) in a pine forest on North Wilderness Loop Trail in Sam Houston National Forest near Richards. Texas, December 27, 2020
 Underside of poison pie mushrooms (Hebeloma crustuliniforme) on North Wilderness Loop Trail in Sam Houston National Forest near Richards. Texas, December 27, 2020
 Side view of poison pie mushrooms (Hebeloma crustuliniforme) on North Wilderness Loop Trail in Sam Houston National Forest near Richards. Texas, December 27, 2020
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