What flower is that?

 
 

  Photos on left and top right: © Francis R. Underwood 2016
Photos center and lower right: Stefan.lefnaer (Own work) [CC BY-SA 4.0
(http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons

This month’s mystery plant is an upright perennial with alternate leaves and yellow flowers on long pedicels which are 1-1.5” in length. The plant is about 2 feet tall and its flowers have 4 petals and 4 sepals.  The petals are 1/2” to ¾” long.  Leaves on the upper stem are mostly entire with no teeth and leaves toward the base of the plant are toothed.  This plant is uncommon in RI and most of New England. It grows in very wet areas such as marshes and swamps.  It blooms from May through June.

Since Newcomb does not reference this plant, it is suggested that the Key in the Go Botany website be used.

It’s…

Botanical Name:
  Rorippa amphibia
Common Name:
  Great Yellow Cress
Family:
  Brassicaceae  (Mustard Family)
Habitat:
  Freshwater marshes and swamps

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