Yellow Foxglove.

I have this too, like you say , really is perennial. I must look for mine, the bamboo was fast approaching lady year. I've never thought of dividing, good plan

It must have been the dividing that set its flowering back, but was not flowering well before, so put the divisions in different locations.

I have this one too, seed sent to me by Meanie several years ago, mines not quite at flowering stage yet.
I managed to germinate seed of my brown one Siris, lost my original plant and the seed had been in my box a few years but I got three plants , whether they'll flower this year I don't know good size though , if they flower I'll save you seed , Ferruginea isn't it I have a picture somewhere in my photos.
I've got Stewartii seedlings too from seed sent to me by Dawn ,can't wait for those to flower :-)

Yes please to brown seed if it obliges.