Uh-Oh: It's the Bad Stuff

Had a closer look at the neighborhood plant that is either Giant Hogweed or Cow Parsnip.  The verdict:

Giant Hogweed

The stems did have the white bristles that distinguish Hogweed from Cow Parsnip, but the determining factor was the seed shape.  Here are the seeds of both:

See how the Hogweed seeds are oval and the Cow Parsnip seeds are heart-shaped?  Here's our seed:

These are green instead of brown because they haven't dried yet.  But they are definitely oval and not heart-shaped.  Therefore, we have the bad stuff!  Oh, no.  I guess I need to call someone?