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Anemone japonica
Anemone hupehensis, Anemone hupehensis var. japonica, and Anemone × hybrida (commonly known as the Chinese or Japanese anemone, thimbleweed, or windflower) are herbaceous perennials in the buttercup family. Height is 3–4 ft (1–1 m). Leaves have three leaflets. Flowers are 40–60 mm (1.6–2.4 in) across, with 5-6 (or up to 20 in double forms) pink or white sepals long and numerous yellow stamens, and bloom from mid-summer to autumn.
These plants thrive best in shady areas and under protection of larger plants, and in all but the hottest and the driest conditions in the United States. They are especially sensitive to drought or overwatering. They can be invasive or weedy in some areas, although they can take some time to become established. It is native to central China, though it has been naturalized in Japan for hundreds of years.
thanks Leuba for the ID confirmation, and to Seema for her input also. I think it may be the same flower, called one thing in Europe and America, and something different in Asia.
I think it's the second one - windflower. My friend's garden has loads of these beautiful tall delicate flowers and she called them the Japanese windflowers.