Collinsonia canadensis Linnaeus. Richweed, Northern Horsebalm. Phen: Late Jul-Sep; Sep-Oct. Hab: Cove forests, rich forests, especially over calcareous or mafic substrates. Dist: QC, MI, and WI, south to Panhandle FL and LA. Recently found on Crowleys Ridge in the AR Coastal Plain.

Origin/Endemic status: Native

Synonymy: = C, Fl6, G, Il, K1, K3, K4, Mi, NE, NY, Pa, S, Tat, Tn, Va, W, WH3, WV, Shinners (1962b); = Collinsonia canadensis L. var. canadensis – F; < Collinsonia canadensis L. – RAB, Peirson, Cantino, & Ballard (2006)

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FAC (taxonomic split from wetland indicator species)
• Eastern Mountains and Piedmont: FAC (taxonomic split from wetland indicator species)
• Midwest: FAC (taxonomic split from wetland indicator species)
• Northcentral & Northeast: FAC (taxonomic split from wetland indicator species)

Heliophily: 3