Prepared by Jennifer L. D’Appollonio, Assistant Scientist, University of Maine, Orono, ME 04469. Updated February 2018.
Scientific name: Rhododendron canadense (L.) Torr.
Common name(s): rhodora, Canada rosebay
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– perennial, woody shrub
– flowers before and/or with leafout
– rose-purple flowers with two-lipped corolla emerge late May-early June in ME
-reaches 1’-3’ in height
buds clusters at twig end and terminal buds have flowers larger than leaf buds
- oblong to elliptical
- hairy leaves dark green above and light green beneath.
-Prefers bogs and poorly drained soils.
-meadows and fields
-shores of rivers
– host plant for the Columbia silkmoth (Hyalophora columbia) in Maine
Hansen, R.W., S.B. Hansen and E.A. Osgood. 1991. Reproductive phenologies of selected flowering plants in eastern Maine forests. ME Agric. Exp. Station Tech. Bull. 143. 17 pp.
Heinrich, B. 1976. Flowering phenologies: Bog, woodland, and disturbed habitats. Ecology. 57(5):890-899.
Go Botany. “Rhododendron Canadense (L.) Torr.” Rhododendron Canadense (Canada Rosebay, Rhodora): Go Botany, 2021, gobotany.nativeplanttrust.org/species/rhododendron/canadense/.