Cup plant (Silphium perfoliatum)

I was eating some cup plant seeds today. Cup plant is a lovely, hardy, sunflower-like perennial, with edible leaves but few mention that the seeds are edible too. They taste, more or less, like sunflower seeds. And they look like them too, if a little flatter and wider. Of course, the number per head is much, much less, in addition to the per-square-meter yield. But I thought I would bring them up as a possibility for perennial sunflower alternatives.

And, of course, they are beautiful plants!