Originally Posted by Jeff zone 8 N.C.

The seed head looks the same as my collard greens and the leaves match, even though they are small. So I would say it is in the Brassica family. That family likes cool weather and will stretch out like that and seed when warmer temps come around. The seeds should be very tiny and black, if some sort of Brassica. You can plant those seed this very late summer to see what the normal plant looks like. They should live through the winter if my guess is correct. Some people even interplant them in their ornamental landscapes.