Wow! I think you are absolutely right. When I saw your post I Googled Henbit and found some photos. That's what it is. Would this be considered a benificial ground cover or should I do more to control it during the off- season?
this is what I've found based on your information:
Dead Nettle and Henbit (Lamium )
Plant Type: This is a non-native herbaceous plant, it is a annual which can reach 30cm in height (12inches).
Leaves: The leaf arrangement is opposite. Each leaf is toothed or lobed.
Flowers: The flowers are irregular in shape and are up to 2cm long (0.75 inches). They are purple. Blooms first appear in early spring and continue into late fall.
Fruit: Henbit has tiny black seeds which are launched from the plant when ripe.
Habitat: Fields, fencerows and gardens and lawns.
Thanks for the quick reply Hank