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B. S. Walters

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Fens, openings in tamarack and cedar (also sometimes spruce) swamps, peaty streamside thickets, interdunal swales, sedge marshes and mat, sometimes in wet, open deciduous forests, rocky openings and outcrops; generally a calciphile and a good indicator of fens.

The leaf blades are of similar proportions to those of R. cathartica, but are more acute, may average a little larger, and have more pairs of lateral veins. These are strongly ascending and curve along the margins, much as in leaves of Cornus (which, however, are strictly entire).

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