A genus of 90-110 species, herbs, primarily North American, but with a few species in South America, Macaronesia, and Eurasia. The placement of the "flat-topped goldenrods" has been controversial; they are sometimes excluded from Solidago and treated as an apparently sister lineage and genus, Oligoneuron.
ID notes: Several related genera sometimes mistaken for (and/or sometimes included in) Solidago are included here as keying “fail-safes”. Key adapted (in part) from various sources, especially FNA and SE.
Ref: Beck et al. (2021); Braun (1942); Brock & Estes (2023) In Weakley et al. (2023, in press); Brouillet & Semple (1981); Cook & Semple (2004); Cronquist (1980); Heard & Semple (1988); Johnson (1995); LeBlond (2000); Levy & Donaldson (2018); Martino, Semple, & Beck (2020); Morton (1973); Morton (1974); Nesom (1993b); Nesom (2009f); Semple (2003); Semple (2013); Semple (2017a); Semple (2022); Semple & Beck (2021); Semple & Chmielewski (2021); Semple & Cook (2006) In Flora of North America Editorial Committee (2006b); Semple & Nelson (2018); Semple & Peirson (2013); Semple et al. (2012); Semple et al. (2015); Semple et al. (2016a); Semple et al. (2016b); Semple et al. (2017a); Semple et al. (2017b); Semple et al. (2019a); Semple et al. (2019b); Semple et al. (2020a); Semple et al. (2020b); Semple et al. (2021); Semple, Bzovsky, & Tong (2016); Semple, Kornobis, & Bzovsky (2018); Semple, Tong, & Chong (2017a); Semple, Tong, & Chong (2017b); Semple, Tong, & Pastolero (2012); Sorrie (2018a) In Weakley et al. (2018a); Zhang (1996). Show full citations.