What plant is that?

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Photo credit: © Francis R. Underwood 2011

This is a perennial plant of wetlands which blooms from July to October. The flowers are greenish-yellow with five and sometimes seven sepals. Petals are usually absent.  It has ten stamens. The leaves are alternate and finely toothed, lance-shaped to elliptic.
It grows in wet, muddy places and in ditches and is 10” to 36” tall.
The flowers are similar to those of the Orpine family into which it was once placed.
It has now been referred to its own family and is the sole member of that monogeneric family. It is listed as a rare plant in Rhode Island.

It’s. . .

Botanical Name:
Penthorum sedoides
Common Name:
  Penthoraceae (Penthorum Family)
  Muddy soil along edges of swamps and in wet ditches
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