Darmera Voss
Darmera is a monospecific genus, native to the western United States (Fortson Wells & Elvander 2009). Its single species, D. peltata (Torr. ex Benth.) Voss, is widely grown as an ornamental and has been recorded as an escape, also in Belgium.
Literature
Fortson Wells E. & Elvander P.E. (2009) Darmera. In: Flora of North America Editorial Committee (eds.), Flora of North America, vol. 8. Oxford University Press, New York-Oxford: 75-76. [available online at: http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=109310]
Gornall R.J. (1989) Anatomical evidence and the taxonomic position of Darmera (Saxifragaceae). Bot. J. Linn. Soc. 100(2): 173-182. [available online at: https://www.researchgate.net/publication/230204253_Anatomical_evidence_a...
Schmid R. (1977) Hello Darmera, good-bye Peltiphyllum. Fremontia 5(2): 21-22.
Schmid R. & Turner M.D. (1977) Darmera, the correct name for Peltiphyllum (Saxifragaceae), and a new combination in Peltophyllum (Triuridaceae). Madrono 24(2): 68-74. [available online at: http://www.biodiversitylibrary.org/page/47941752#page/84/mode/1up]
Soltis D.E. (1986) Karyotypic relationships among Astilboides, Bergenia, Darmera and Mukdenia and their implications for subtribal boundaries in Saxifrageae (Saxifragaceae). Canad. J. Bot. 64(3): 586-588.