Plumose or Plumed Goldenrod
Solidago plumosa Small is known from one location, a short stretch of the Yadkin River, Stanley Co., North Carolina. It was thought to be extinct but was rediscovered in 1994. See Semple & Cook (2006 FNA) for a detailed description. Solidago plumosa is distinguished by having linear lanceolate middle and upper stem leaves, multiple peduncle bracts, and glabrous cypselae. Solidago plumosa is likely closely related to S. austrocaroliniana, S. kralii, and S. arenicola. All fours species are included in S. subsect. Humiles and are rare to very rare in the southeastern US.
The species is diploid 2n=18 (Peirson et al. 2012). Semple and Cook (2022) published cytogeography maps for S. plumosa and related species.
Semple et al. (2019) presented a multivariate analysis of all 13 species included in S. subsect. Humiles at that time. Solidago plumosa was included in the 12 and 11 species analyses (100 % and 100% correct placment a posteriori) and in the analysis of the 4 species native to the southeastern US (100% correct placment a posteriori). Semple and Beck (2021) placed S. plumosa in S. subsect. Erectae.