Question: This small plant (less than a foot tall) grows in a marshy clump at the end of Russell Reservoir in …
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Question
This small plant (less than a foot tall) grows in a marshy clump at the end of Russell Reservoir in Harrisville, NH: marshy but not sphagnum. I noticed the clasping opposite leaves at 90 degrees to the whorls above and below, and the purple color. No flower, this was taken in the spring I believe.
Answer
Dear David, this is a species of Triadenum (marsh-St. John's-wort), in the Hypericaceae (St. John's-wort family). There are two species in New England, for which you need the flowers or fruits to identify them apart.
