Cardamine latior (Brassicaceae), a new species endemic to the subantarctic Auckland Islands, New Zealand

Cardamine latior is described as a new species endemic to Auckland Island and Adams Island. It was previously included in a broad taxonomic concept of C. subcarnosa, a species now considered to be endemic to Campbell Island. Cardamine latior is distinguished from C subcarnosa by vegetative and fruit characters, including having shorter leaves with more leaflets, leaflets that usually overlap, more prominent leaf margin hydathodes, short and compact inflorescences, distinctly erect and broader siliques with a wider replum, and the septum with a distinct central vein. Cardamine latior is most common at higher altitudes on mountain-top screes. A description is provided and lectotype selected for C subcarnosa.