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| Verbean bonareinsis | Verbena tenuisecta |
Generally all verbenas are good nectar plants, the problem is that most are annuals or can’t stand the cold.
In St. Louis, two verbenas that reseed themselves are:
Verbena bonariensis – grows tall.
Verbena tenuisecta – Moss Verbena (only 12″ tall)
I did try Verbena rigida – Sandpaper Verbena – don’t grow this variety – it’s not a good nectar plant and it is invasive via underground runners.
Butterfly Gardening 
I like Verbean bonareinsis a lot. In Erie,PA it reseeds readily but is easily controlled and stays blooming until heavy frost. It’s my last nectar plant of the season every year