well it isn't an astible. but I 've no idea what it is. :o)

Agree not an Astilbe but no idea what it is!

unless it is a really dry one ;o)

I think it's an Aruncus dioicus 'Kneiffii'.

Honeysuckle, thanks...I think this could be it. The foliage looks less verdant, but the rest of the description fits the plant. I will keep you posted. It must have landed in a grower's pot.