Aha! “Cleistogamy … describes the trait of certain plants to propagate by using non-opening, self-pollinating flowers” — http://en.wikipedia.org/wiki/Cleistogamy
Retired economics professor (“dismal scientist”). Married 40+ years to the love of my life; we have two grown daughters, both married, two granddaughters and a...
Let me know what it is! We have LOTS of it here in Ga in our yard! Especially at the lakehouse, where we let the lawn get more grown up with "weeds." I love weeds. Most are so pretty!