Shade Gardening: buttercups, 1 by Weerobin

Weerobin wrote:
Do any of you have experience with the variety of buttercup called 'Brazen Hussy'
(ranunculus ficaria Brazen Hussy)?
My understanding is that ranunculus ficaria can be fairly aggressive, so I've avoided it.
But there are a million cultivars which are supposedly better behaved.
Brazen Hussy is a dark leaved cultivar which is not supposed to be aggressive.
I planted a couple over the past year or two.
I thought they looked nice with the bright yellow flowers set off by the dark leaves (pic 1).
But this year I'm a little alarmed at several patches of buttercups with green leaves
adjacent to the dark leaved plants (pic 2) - and please don't mention the weeds!
I presume these are revertants to the straight species?
Do any of you have horror stories about the straight species?
If not, I still like the bright bloom and they look nice in the woods and I might let them run a little.
But I'll nip them in the bud if you guys report 'houttuynia-like' experiences...