24: Poison ivy. Still poisonous in the winter form. (Prospect Park, Mar 3, 2024)

9: Poison ivy winter form. Still poisonous. (Prospect Park, Mar 4, 2001)

13: Poison ivy in amongst the violets. (Central Park, May 8, 2005)

2: Poison Ivy (Wildman always points this out). (Alley Pond Park (Woods), May 14, 2000)

3: Patch of poison ivy. It is all over this park! (Alley Pond Park (Woods), May 14, 2000)

18: Poison ivy. (Prospect Park, May 22, 2011)

4: Poison ivy. (Prospect Park, May 27, 2000)

14: Poison ivy. Ground type. (Central Park, May 30, 2005)

15: Poison ivy. Climbing type. (Central Park, May 30, 2005)

5: Poison ivy (Central Park, Jun 10, 2000)

16: Poison ivy on tree. (Prospect Park, Jul 1, 2006)

17: Poison ivy on ground. Leaf edges are smooth. Middle leaf has stem. Side leaves do not. (Prospect Park, Jul 1, 2006)

6: Poison ivy (Central Park, Jul 2, 2000)

10: Poison ivy. (Forest Park, Jul 4, 2001)

19: Poison ivy. (Forest Park, Jul 4, 2011)

11: Poison ivy. (Prospect Park, Jul 8, 2001)

7: Poison Ivy. See three leaves. (Prospect Park, Jul 9, 2000)

20: Poison ivy. (Inwood Park, Jul 17, 2011)

21: Poison ivy vine form is all over the tree. Note the berries in the summer. (Inwood Park, Jul 17, 2011)

12: Poison ivy. (Prospect Park, Jul 29, 2001)

8: Poison ivy (Prospect Park, Sep 2, 2000)

1: Blackberry. (Cunningham Park, Nov 14, 1999)

22: Poison ivy, vine form. It is poisonous all the time. (Prospect Park, Dec 2, 2023)

23: Poison ivy, vine form. It is poisonous all the time. (Prospect Park, Dec 2, 2023)