Common Name
American bladdernut
Family
Staphyleaceae
Habitat
understory tree or shrub, likes riverbanks and similar moist areas
Observed Blooming
early April to early May, 2017
early April, 2016
mid to late April, 2015
mid April to early May, 2014
late April, 2013
Conservation
endangered in Florida
threatened in New Hampshire
Elizabeth's Wildflower Blog 
I enjoy your site so much, I just started identifying flowers on my walks/hikes in MoCo, and it is the most helpful. Do you know any groups who do hikes together with the purpose of seeking out and identifying wildflowers and welcome newbies?
Hi, Beata – Maryland Native Plant Society does some walks, though they seem to be most active in the spring. If you’re on face book check out their page at https://www.facebook.com/Maryland-Native-Plant-Society-232641092294, or the related discussion group:
https://www.facebook.com/groups/marylandnativeplantsocietydiscussiongroup.
I’m not sure but I think the Virginia Native Plant Society is more active.
Other than these I don’t know of any groups.