R. W. Smith

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Banks of rivers and streams, shores, often in very calcareous sites; occasionally in swamps or swales farther from borders of water; also on rock outcrops in the northwestern Upper Peninsula. A handsome shrub in flower (resembling a large cultivated Spiraea) or fruit. The pedicels (crowded in a dense umbellate or corymbose raceme) and calyx are usually lightly to heavily pubescent with stellate hairs. The fruit is often somewhat stellate-pubescent also; such plants are found from southern Michigan to Lake Superior and do not seem to warrant varietal recognition.

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