Unknown perennial

This plant grows in Maryland, USA, and started blooming in August. It is still blooming. Can someone identify this?

 

Anemone tomentosa or similar.

 

Anemone hupehensis or close relative thereof.

 

Thanks for the quick responses. What is the difference between anemone tomentosa and anemone hupehensis?

 

Not a lot!

 

Look at couplet 22 for the key difference between the two species.

http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=101733

 

Thanks. The plant is probably A. hupehensis. The leaf feels a bit hairy, but I'm not sure how easy it is to distinguish downy from bristly.

 

Yeah . . . the difference between strigose (bristly-hairy) and tomentose (densely hairy) leaf undersides isn't easy! What if it is densely bristly-hairy??

I'd guess it hardly matters, unless you're a professional botanist ;-)

 

They are both tormentors, if you let them run loose in your garden.

 

Doesn't matter if the botanist gets paid or not, the difference in pubescence is best viewed with a hand lens and felt by touch. Strigose would feel rough to the touch while tomentose would feel silky. Garden hybrids between the two species would most definitely blur the distinction.