The weed is some sort of Acacia. The bipinnate foliage is the juvenile form.


Huh? I thought some acacias were always bipinnate. I have a bonsai grove of
sweet acacia, A. farnesiana. Some of the trees are about 5 years old. They have
never been anything but bipinnate.
I looked at some pictures on the Web. Photos of A. farnesiana, and some USDA
drawings of several acacias, all show bipinnate foliage.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"When you come to a fork in the road, take it." Yogi Berra