Dave Fouchey wrote:

What part of the country you in? Were they heart shaped leaves or
toothed and deeply sculpted?

Zone 6b, Northern Arkansas. They were heart shaped. Probably the
same plant as was suggested elsewhere in the thread. I plan on going
back and getting a picture of it just in case it is something special.
Assuming it is still there. An older gentleman was out there digging
up flower bulbs earlier this year. Some people take "public park" too
literally. =)