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Solidago porteriÌýSmall is a very rare species native to Georgia, Alabama and Tennessee.Ìý Cronquist (1980) discussed the species underÌýS. hispidaÌýnoting it was only known from the type collection in Jasper Co., Georgia.Ìý Semple and Cook (2006 FNA) treated the species as a synonym ofÌýS. erectaÌýbased on stem pubescence traits.Ìý Semple and Estes (2014) reported the discovery of the species at one site in Tennessee and one (now extirpated) site in north central Alabama.Ìý They also noted the occurrence of a second site in Georgia slightly north of the original 1842 collection by Porter.Ìý Honeycutt et al. (2017) reported the discovery of another disjunct population in western Georgia.Ìý The species is distinguished within S. ser. Albigula by its combination of glabrate lower stems and sparsely hispid-strigose upper stems, stem leaves that are sparsely hispid-strigose on the under surface, and its large heads with showy rays.Ìý Like other members of sect. Erectae, the largest leaves are the petiolate lower stem leaves and the inflorescence arrays are elongated wand/club shaped.

The Alabama and Tennessee collections of the species were initially treated asÌýS. petiolarisÌýby both Semple and by Dwayne Estes, but ultimately recognized to be conspecific with the type specimens ofÌýS. porteri.Ìý Nesom annotated theÌýPorter s.n.Ìýtype material from Georgia asÌýS. buckleyiÌýand included it in his distribution map of that species andÌýS. petiolarisÌý(Nesom 1990).Ìý Semple and Gandhi (2012) noted the revised identification asÌýS. porteriÌýand presented a revised distribution ofÌýS. buckleyi.Ìý BothÌýS. buckleyiÌý²¹²Ô»åÌýS. petiolarisÌýare members of sect.ÌýThyrsifloraeÌýwhose members lack large basal stem leaves and have usually glandular inflorescence parts.

The species is the only hexaploid (2n=54) in S. ser. Albigula (Raf.) Semple & J.B. Beck

Solidago porteriÌýwas included in a multivariate study of 14 species ofÌýS.Ìý²õ³Ü²ú²õ±ð³¦³Ù.ÌýSquarrosaeÌý(as delimited by Semple et al. 2017), in a multivariate study of theÌýS. bicolorÌýcomplex along withÌýS. hispida,ÌýS. roanensis, andÌýS. sciaphilaÌýand more broadlyÌýS. erectaÌý(Semple et al. 2017), and in a study ofÌýS. georgiana,ÌýS. porteri,ÌýS. roanensis,ÌýS. squarrosaÌý²¹²Ô»åÌýS. villosicarpaÌý (Semple et al. 2017).Ìý In all three studies,ÌýS. porteriÌýwas found to be one of the most distinct species in complex.

Honeycutt, E., T. Patrick, and J.C. Semple. 2017.ÌýSolidago porteriÌýa goldenrod rediscovered. Tipularia 32: 44-48.

Semple, J.C. , and D. Estes. 2014. Discovery ofÌýSolidago porteriÌý(Asteraceae: Astereae) in Alabama and Tennessee and a second population in Georgia.Ìý Phytoneuron 2014-45: 1–11.

Semple, J.C., L. Tong, and Y.A. Chong.Ìý 2017.Ìý Multivariate studies ofÌýSolidagoÌý²õ³Ü²ú²õ±ð³¦³Ù.ÌýSquarrosae. I. TheÌýSolidago speciosaÌýcomplex (Asteraceae: Astereae).Ìý Phytoneuron 2017-18: 1–23.

Semple, J.C., L. Tong, Y. A. Chong and M. Kaddoura.Ìý 2017.Ìý Multivariate studies ofÌýSolidagoÌý²õ³Ü²ú²õ±ð³¦³Ù.ÌýSquarrosae. II. TheÌýSolidago bicolor –S. hispidaÌýcomplex (Asteraceae: Astereae).Ìý Phytoneuron 2017-33: 1–44.

Semple, J.C., L. Tong, and A. Chuong.Ìý 2017.Ìý Multivariate studies ofÌýSolidagoÌý²õ³Ü²ú²õ±ð³¦³Ù.ÌýSquarrosae.Ìý III.ÌýS. georgiana,ÌýS. porteri,ÌýS. roanensis,ÌýS. squarrosaÌý²¹²Ô»åÌýS. villosicarpaÌý(Asteraceae: Astereae).Ìý Phytoneuron 2017-55: 1–17.

Last revised 19 May 2025 by J.C. Semple

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