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Solidago nanaÌýNutt. is native to dry to wet soils, often alkaline meadows and flats, and open wooded slopes of the the Great Basin and western slope of the central Rocky Mts. in the U³§.Ìý The species is distinguished by having heads secund, in rounded, secund pseudo-flat-topped pyramidal inflorescences and stems and leaves with dense short soft hairs (). It is the only species inÌý³§.Ìý²õ³Ü²ú²µ.ÌýNemoralesÌýthat can look whitish in the field due to a higher density of short hairs. It shoots develop from a short branching caudex rather elongated rhizomes. The species is diploid (2n=18).

Solidago nanaÌýwas included in a multivariate study ofÌýS.Ìý²õ³Ü²ú²õ±ð³¦³Ù.ÌýNemorales as defined at the time (Semple et al. 2018) and separated strongly from the other six species using only four floral characters.Ìý A key to the taxa in the subsection was included in the article. Included in the analysis wasÌýBaker 722 COLO from Pagosa Springs, Archuleta Co., Colorado and was placed intoÌýS. nanaÌýin the classification analysis although it had previously been identified incorrectly asÌýS. rigidaÌý(²¹²Ô»åÌýOligoneuron rigida); it was the unseen voucher cited for the presence ofÌýS. rigida in the Flora of the Four Corners.

Collections labeled asÌýS. nanaÌýfrom the Front Range in Colorado that I have seen were allÌýS. decemfloraÌýorÌýS. velutina.Ìý This may be true for other collections that are the basis of literature/internet reports indicated on the map below from further east In Colorado.Ìý The range appears to be broken up into many disjunction areas.Ìý

Solidago nanaÌýwas included in the polygenomic phylogeny ofÌýSolidagoÌýand was placed in theÌýS.Ìýsubg.ÌýNemoralesÌýclade with 100% probability (Semple et al. 2023).

Semple, J.C., K. Kornobis, and S. Bzovsky. 2018. A multivariate morphometric analysis ofÌýSolidagoÌý²õ³Ü²ú²õ±ð³¦³Ù.ÌýNemoralesÌý(Asteraceae: Astereae).Ìý Phytoneuron 2018-42: 1–40.

Semple, J.C., H. McMinn-Sauder, M. Stover, A.Lemmon, E. Lemmon, and J.B. Beck. 2023. Goldenrod herbariomics: Hybrid-sequence capture reveals the phylogeny of diploid Solidago. Amer. J. Bot. 110(7): e16164. https://doi.org/10.1002/ajb2.16164

Last revised 16 April 2025 by J.C. Semple

© 2025 J.C. Semple, including all photographs unless otherwise indicated