What is this frilly-leaved plant?

While I'm asking dumb questions, what is this?  It appeared near where my Good King Henrys disappeared, but the leaves are wrong.  It's about 2 feet high - that's lady's mantle in the background for comparison.  And the edges are not quite so silvery in real life as in the photo.

It's quite pretty.  Is it useful?

It looks like a member of the parsley and carrot family, which includes some highly poisonous plants as well as some useful and edible ones.



This page has some useful information.

Indeed what I suspected.  Which is why I did NOT taste it.  I do have Botany in a Day - thank you for the reminder and I will look it up that way when I'm next at the garden!  Thank you!

I have seen that exact same plant in a FB group.
If I remember correctly it was not yet identified 100%. One guess was Jacobea vulgaris (common ragwort). To identify, you can crush the leaves which will have a repulsive odour.

Careful, it is poisonous for some animals.
If it is ragwort indeed, it will bloom in the second year. It is fodder plant for some specialized butterfly caterpillars.

I would guess at ragwort as well, invasive and poisonous to livestock (long term liver damage)

3rd vote for ragwort, somewhat useful

http://www.english-country-garden.com/flowers/ragwort.htm