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Reported in fen with Carex sp. present (Macaulay and Pohl 2002). Endothenia sp. occurring in Finland that also show an affinity for Carex sp. have been observed in moist open areas such as peat bogs (Laasonen and Laasonen 1995).

A large sized species of Endothenia. Size and colour patterns of this species show wide variation over different geographic locations (Heinrich 1926). Recorded specimens from Alberta show an enlarged dark patch in the middle of the forewing, which is often triangular in shape. Heinrich (1926) also uses this dark patch as a distinguishing characteristic. Forewing color of recorded specimens ranges from a light creamy brown to a very dark brown sometimes appearing almost black. Superficially resembles E. quadrimaculana but has a smaller forewing length and a fewer number of apical spines on the uncus.

Larvae are known to feed on the roots and stem bases of plants in the genus Stachys, especially hedge nettle (Stachys palustris) (Macaulay and Pohl 2002). European records indicate that the larva will also feed on Mentha and Symphytum roots and lower parts of the stem (Heinrich 1926).

Reported from several states in the United States of America including: Maryland, Pennsylvania, Illinois, Iowa, Wisconsin, New Mexico, Colorado and California. In Canada this species is known to occur in the provinces of British Columbia, Alberta, Manitoba, Saskatchewan and Quebec. (Heinrich 1926). Alberta specimens have been collected in Edmonton, Red Deer and Nordegg.