Tiarella
genus of plants, the foamflowers
Tiarella, the foamflowers, is a genus of flowering plants in the family Saxifragaceae. The generic name Tiarella means "little turban", which suggests the shape of the seed capsules. Worldwide there are seven species, one each in eastern Asia and western North America, plus five species in eastern North America. As of October 2022, the taxonomy of Tiarella in eastern North America is in flux.
Description
Plants of genus Tiarella are perennial, herbaceous plants with short, slender rhizomes. Three morphological features are used to distinguish Tiarella species: 1) presence or absence of stolons; 2) size and shape of basal leaves; and 3) presence or absence of stem leaves (also called cauline leaves). Two species of Tiarella have stolons (T. austrina, T. stolonifera) while two other species have stem leaves (T. nautila, T. austrina). Plants from the southern Blue Ridge Mountains and southward have relatively large basal leaves with an extended terminal lobe (T. austrina, T. nautila, T. wherryi).
The following identification key was published by Guy Nesom in 2021:
Taxonomy
In 1753, Swedish botanist Carl Linnaeus established genus Tiarella by recognizing two species, Tiarella cordifolia and Tiarella trifoliata. A third species, Tiarella polyphylla, was described by David Don in 1825.
This brief starts where responsible research should: with the source description of “Tiarella” as genus of plants, the foamflowers. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the science & nature register because the source frames it as genus of plants, the foamflowers. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Jul 22, 2026. The linked authority identifier is Q1456298. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2022, 2021, 1753 and 1825.
Current terminology should not be projected backward without checking the classification used when the underlying evidence was created. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Check terminology, classification and the date of the cited evidence. Scientific names and technical consensus can change while older records retain historical value.
- Current terminology
- Classification context
- Finding cited technical literature
Primary datasets, specimen catalogues, standards bodies and the most recent peer-reviewed literature.
Three-step research path
- Establish the record: confirm the title “Tiarella”, its source revision and the description used here.
- Expand the search: follow Tiarella primary sources, Tiarella archive and Tiarella research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Tiarella”?
- Has classification or technical consensus changed since the cited source?
- Is the terminology current, historical or disputed?
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This entry incorporates text from “Tiarella” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.