Baked dry clay. Is there a plant I haven't thought of?

Have I missed something?
Verbena boniarensis
Euphorbia( not all)
Iris foetedisima and sometimes others
Marjoram
Hardy geraniums
Some salvia greggii
Purple toadflax
I'm happy to consider wildflowers apart from michaelmas daisies.

 

Quite a good list already of all the ones that spring to mind. Only others popping into mine are Buddleja, Cistus, Erigeron and maybe some annuals which will self seed like Eschscholzia, fennel

 

Unfortunately, I have most of those already but they are excellent choices and I can't bear the smell of cistus. I might look for a compact budleia if there's such a thing.
Thanks @Butterfly6

 

We have buddleias growing in heavy clay. We also have seedlings that we are able to pass onto family and neighbours.
Another great success are the hydrangeas. We have nearly red, white and blue ones and this year they are magnificent.
And then the Acanthus mollis. Again they can take over and self seed but the flowering spikes are ones that last a long time.

 

Thank you @On the Levels . I have a white buddleia but it's huge and leggy even though I cut it back mercilessly. It's growing in the shade so that might account for it but it certainly doesn't mind sitting in dry 'concrete'

 

Buddleia "Nanho" types are compact (about waist high) and do the trick.

My heavy clay surprisingly enough, is great for Hydrangeas and Roses. However, the Hydrangeas were already established and the Roses got plenty of manure etc in their planting holes. Just chucking a young plant in would probably not work very well.

In other plants, Vinca does well, I have a very pretty and useful Minor variegated one which is a great filler. Corncockles from annuals. Phlox also seems to be doing well. (I don't like Phlox...)

 

Vinca does tooooo well.
The variegated one is well-behaved and welcome.
Not keen on most phlox either - but the slugs are extremely partial to them. Haven't tried corncockles.
Catananche were lovely this year, but it's a bit of a wait for them to flower from seed. I hope they survive until next year
@Selleri