| Summary: | Typifications are made for six taxa in the Brassicaceae described by Robert Brown from plants collected in arctic North America. The taxa were published in his 1823 preprint Chloris Melvilliana , which in 1824 appeared as the botanical appendix to William E. Parry's Supplement to the Appendix of Parry's First Voyage . Lectotypes are selected for Eutrema edwardsii R. Brown, Parrya arctica R. Brown, Parrya macrocarpa R. Brown, Platypetalum R. Brown, and Platypetalum pur- purascens R. Brown, and a neotype is selected for Platypetalum dubium R. Brown.
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