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Tiarella Linnaeus. Foamflower.

Key to Tiarella

A genus of 3-6 species, perennial herbs, of temperate North America and e. Asia. The taxonomy of eastern North American Tiarella has been controversial, ranging from the recognition of a single, variable species (T. cordifolia s.l.) to recognition of 2-5 taxa at various ranks (species, subspecies, and varieties). We here follow Nesom (2021a) as finally presenting a comprehensive and modern view of taxa and ranks, and based on field studies and the much greater accumulation of available herbarium specimens that have accrued since Lakela (1937), Wherry (1940, 1949), and Fernald (1943, 1950). Additionally, Nesom's (2021a) analysis demonstrates that the typic component of Tiarella cordifolia must represent the non-stoloniferous taxon present in eastern Virginia, contrary to the misapplication by previous authors.

Ref: Fernald (1943); Fernald (1950); Jog (2009) In Flora of North America Editorial Committee (2009); Lakela (1937); Nesom (2021a); Soltis In Kubitzki, Bayer, & Stevens (2007); Spongberg (1972); Wherry (1940); Wherry (1949). Show full citations.

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Hover over a shape, letter, icon, or arrow on the map for definition or see the legend. Data for arrows not developed for genera and families which may have species only occurring outside the flora area.

image of plant© Bruce A. Sorrie | Tiarella cordifolia | Original Image ⭷
image of plant© Scott Ward | Tiarella austrina | Original Image ⭷
image of plant© Alan M. Cressler | Tiarella cordifolia | Original Image ⭷
image of plant© Brandon Corder | Tiarella stolonifera source | Original Image ⭷
image of plant© Gary P. Fleming | Tiarella cordifolia | Original Image ⭷
image of plant© Scott Ward | Tiarella austrina | Original Image ⭷
image of plant© Gary P. Fleming | Tiarella stolonifera | Original Image ⭷
image of plant© Gary P. Fleming | Tiarella cordifolia | Original Image ⭷

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See something wrong or missing on about Tiarella? Let us know here: (Please include your name and email if at all complicated so we can clarify if needed.) We greatly appreciate feedback, and will include updates from you in our next webapp update, which can take a few months.