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Populus tremuloides Michx - Salicaceae
quaking aspen, trembling aspen, American aspen, Canadian aspen, Amerikanische Espe
Deciduous tree, up to 20m high, native to North America (Canada, Rocky Mountains); bark greenish-gray; leaves on long stalkes (3-7cm), small (4-8cm), oval to nearly round, with small rounded teeth; flower at catkins (4-6cm long), produced in early spring before the leaves, dioecious.
http://en.wikipedia.org/wiki/Populus_tremuloides
„Poplar bark is a traditional medicine against rheumatoid arthritis and other rheumatic conditions, but also cystitis, diarrhoea and the common cold. The leaves and bark are used for urinary problems rseulting from an enlarged prostate. Buds are used against chronic bronchitis and rheumatism and externally for treating superficial wounds, external haemorrhoids, frostbite and sunburn 8and as an ointment for myalgia).“
[Medicinal Plants of the World. Ben-Erik Van Wyk and Michael Wink, Pretoria 2004, 252]