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The genus Brunnera contains only three species but only one is grown in cultivation, B. macrophylla, a native of eastern Europe. It is a member of the Borage Family, Boraginaceae, being related to such plants as borage, lungwort and Virginian bluebells. The genus was named after a 19th century Swiss botanist named Samuel Brunner.

Wild ginger or Asarum is probably more well-known by wildflower enthusiasts or hikers than by gardeners. As a forest-floor wildflower, they are common throughout eastern North America, the Pacific Northwest, much of western Europe and east Asia. In fact, of the 70 or so species, the vast majority hail from east Asia. There are 8 species in North America and only one occurs in Europe.

Adiantum (pronounced /ˌædiˈæntəm/), the maidenhair ferns, is a genus of about 200 species of ferns in the family Pteridaceae, though some researchers place it in its own family, Adiantaceae. The genus name comes from the Greek, meaning "not wetting," referring to the fronds' ability to shed water without becoming wet.