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³§´Ç±ô¾±»å²¹²µ´ÇÌý´Ç²Ô³Ù²¹°ù¾±´Ç±ð²Ô²õ¾±²õ (Ringius) Semple & Peirson is native to calcareous and basaltic rocks on shorelines in Ontario and Michigan.  Solidago ontarioensis is similar to S. glutinosa, but has usually taller involucres and larger shoots have a more open inflorescence with longer branches; cypselae are moderately to densely strigose proximally and distally. The species was treated as Solidago simplex±¹²¹°ù.Ìýontarioensis (Ringius) Ringius by and included in ssp. randii.  The species is tetraploid (2n=36) throughout its range (Peirson et al. 2012).

Semple et al. (2019) presented a multivariate analysis of all 13 species of S.Ìý²õ³Ü²ú²õ±ð³¦³Ù.ÌýHumiles. Solidago ontarioensis was included in the analyses of all species, in the analyses of just the 6 species native to mid western and northeastern US and adjacent Canada, and in the analysis comparing just S. glutinosaÌý²¹²Ô»åÌýS. ontarioensis. In the 12 and 11 species analysis, specimens of S. ontarionensis did not form a well supported group a posteriori.  In the 6 species analyses, the S. ontarioensis group held together with much more support (82% and 91% correct placement a posteriori).  In the two species analysis, the S. ontarioensis group held together with 91% correct placement a posteriori).

Semple, J.C. , and J.A. Peirson.  2013.  A revised nomenclature for the Solidago simplex complex (Asteraceae: Astereae).  Phytoneuron 2013-41. 1-5.

Semple, J.C., K. Kornobis, A. Mazzorato, G.S. Ringius, and J.A. Peirson. 2019. A multivariate morphometric analysis of Solidago²õ³Ü²ú²õ±ð³¦³Ù.ÌýHumiles (Asteraceae: Astereae).  Phytoneuron 2019-25: 1–61.

Last update 86 April 2025 by J.C. Semple     

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