Synonyms: Alnaster crispus (homotypic); Alnus alnobetula var. crispa (homotypic); Alnus alnobetula var. repens; Alnus crispa (homotypic); Alnus crispa crispa; Alnus crispa f. stragula; Alnus crispa var. crispa; Alnus crispa var. elongata; Alnus crispa var. harricanensis; Alnus crispa var. mollis; Alnus hultenii; Alnus mitchelliana (homotypic); Alnus mollis; Alnus ovata f. macrophylla; Alnus ovata f. repens; Alnus ovata var. repens; Alnus repens; Alnus undulata; Alnus viridis crispa (homotypic); Alnus viridis f. groenlandica; Alnus viridis f. macrophylla; Alnus viridis f. pubescens; Alnus viridis f. typica; Alnus viridis var. crispa (homotypic); Alnus viridis var. repens; Betula alnus var. crispa; Betula alnus-crispa; Betula crispa (homotypic); Duschekia crispa (homotypic)