Vascular Plants of North Carolina
Account for Southeastern Stiff Goldenrod - Oligoneuron jacksonii   (Kuntze) Small
Members of Asteraceae:
Members of Oligoneuron with account distribution info or public map:
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Section 6 » Family Asteraceae
Author(Kuntze) Small
DistributionPiedmont only. Note the large gap, which appears to be real, as this plant can hardly be overlooked. Weakley (2020) elevated this taxon -- formerly considered as Oligoneuron rigidum var. glabratum -- to full species status, as O. jacksonii.

VA to OH and MO, south to GA and TX.
AbundanceRare over the whole of its Piedmont range, though can be uncommon to locally common. Nonetheless, this is a State Special Concern taxon (listed by the NC Plant Conservation Program as O. jacksonii). It is not listed as this by NatureServe, which considers it as O. rigidum var. glabratum, with a Global Rank of G5T4.
HabitatDry to mesic mafic soils of glades, barrens, open woodlands, roadsides, and powerlines.
PhenologyFlowering and fruiting late August-October.
IdentificationThe two Stiff Goldenrods are distinct among our species in having spreading, relatively flat-topped inflorescences and elliptical stem leaves. Stems grow 3-6 feet tall from a basal rosette of stalked, lance-shape to elliptical leaves. Stem leaves are rather stalkless, elliptical, and with blunt marginal teeth. Midwestern Stiff Goldenrod (O. rigidum) differs in its moderately to densely short-hairy stems (vs. glabrate) and short-hairy outer involucral bracts (vs. glabrous).
Taxonomic CommentsIn 2020, Weakley transferred Solidago rigida to Oligoneuron, following Nesom (paper in Phytoneuron 2020). While not without controversy, the recognition of the latter genus has gained favor among geneticists and botanists in recent years. However, we regard the elevation of the 2 varieties of rigida to full species status to be premature and want to see additional published research. He has proposed the name of O. jacksonii for this taxon. However, as the NC Plant Conservation Program list (2021) now shows O. jacksonii as legally State Special Concern, as is also followed by the NCNHP, the authors reluctantly feel obliged to now use O. jacksonii as the taxon name here.

Other Common Name(s)Southeastern Bold Goldenrod
State RankS2
Global RankG5T4 [G4]
State StatusSC-V
US Status
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B.A. SorrieUnion County, same data. Basal leaves. UnionPhoto_natural
B.A. SorrieUnion County, 2011, roadside, Joe Kerr Road just W of Marvin School Road. UnionPhoto_natural
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