Publication: Prodr. 2: 630. 1825.
Origin: Introduced from northern Europe
selected vouchers: WTU
Notes: Naturalized on Crane Island in San Juan Co., apparently the only wild population in North America (Phipps 1998). Wisskirchen and Haeupler (1998) place C. oxyacantha in synonymy with a different European species, C. rhipidophylla Gand, and note it is a rejected name.
References: (none)