Geum Linnaeus. Subfamily: Rosoideae. Tribe: Coluriae. Common name: 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

References: 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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