Physocarpus opulifolius (Linnaeus) Maximowicz var. opulifolius . Eastern Ninebark. Phen: May-Jul. Hab: Stream banks, riverside thickets and scour prairies, rock outcrops, cliffs, fens, seepage swamps, especially over mafic or calcareous rocks. Dist: QC west to WI, south to SC, TN, and n. IL.

Origin/Endemic status: Native

Synonymy: = C, F, G, Il, K1, K3, K4, Tn, Va, Robertson (1974); = Opulaster opulifolius (L.) Kuntze – S13; = Physocarpus opulifolius (L.) Maxim. – FNA9, NE, Spencer & Bruederle (2020); > Opulaster australis Rydb. – S; > Opulaster opulifolius (L.) Kuntze – S; < Physocarpus opulifolius (L.) Maxim. – Mi, NY, Pa, RAB, Tat, W, WV

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Wetland Indicator Status:

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

Heliophily: 7