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Geum Linnaeus. Subfamily: Rosoideae. Tribe: Coluriae. Avens.

Key to Geum

A genus of 40-60 species, herbs, mainly of north temperate areas. Many researchers have advocated breaking Geum into varying numbers of segregate genera; even the most conservative of these divisions place G. radiatum in a genus separate from our other species (such as Parageum; see synonymy) and some would place G. vernum in Stylipus. Molecular studies (Smedmark 2006; Smedmark & Eriksson 2002) have made a case for a broad circumscription of Geum, including Waldsteinia, as many of the segregates are complexly and reticulately interrelated; more recent studies have pushed back against including Waldsteinia and some other segregates in Geum, based on more detailed hypotheses of the phylogeny of the Coluriae. We here retain Waldsteinia at its traditional genus rank. Hough (2018) provided a useful report on various hybrids of our native Geum.\; Chapman-Lam (2022) also discussed hybrids between several of our species.

ID notes: Hybrids have been documented between many of our species: aleppicum × rivale, aleppicum × urbanum, canadense × laciniatum, canadense × urbanum, laciniatum × urbanum, rivale × urbanum

Ref: Bolle (1933); Chapman-Lam (2022); Hough (2018); Hough, Gilman, & Chapman-Lam (2022); Kalkman In Kubitzki et al. (2004); Král (1966); Phipps (2014b) In Flora of North America Editorial Committee (2014); Robertson (1974); Rohrer (2014a) In Flora of North America Editorial Committee (2014); Shattelroe et al. (2021); Smedmark (2006); Smedmark & Eriksson (2002); Weakley & Gandhi (2008). 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© Alan Cressler: Geum geniculatum, Grassy Ridge Bald, Pisgah National Forest, Avery County, North Carolina 1 by Alan Cressler | Geum geniculatum source | Original Image ⭷
image of plant© Gary P. Fleming | Geum virginianum | Original Image ⭷
image of plant© Gary P. Fleming | Geum laciniatum | Original Image ⭷
image of plant© Gary P. Fleming, stipule | Geum vernum | Original Image ⭷
image of plant© Gary P. Fleming | Geum virginianum | Original Image ⭷
image of plant© Erik Danielson | Geum rivale source | Original Image ⭷

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See something wrong or missing on about Geum? 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.