What plant is that?

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September 2010 Mystery Plant -- flower September 2010 Mystery Plant plant and bud
Photo credits: Garry Plunkett

The September Mystery Plant photo shows the unopened involucre of a Swamp Thistle, Cirsium muticum. They grow up to nine feet tall in wet areas. The one shown was photographed on a flood plain of Sin and Flesh Brook in Tiverton. A distinguishing feature of this species is the fine white hairs on the involucre visible in the photo. Above at right is a photo of the plant in flower, not unlike other thistle species.

It’s. . .

Botanical Name:
Cirsium muticum
Common Name:
  Swamp Thistle
  Asteraceae (Aster Family)
  Wet meadows, woods and streambanks
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