The least common member of its genus in Vermont, scattered at fewer than 10 known sites across the state. Seemingly more tolerant of silt than its relatives, it is known from slower streams and rivers and is our lowest elevation member of its genus. Hunt et al. reports this species from several sites along the Connecticut River corresponding especially to Windsor and Windham county sections. Owing to the relative lack of data on this species in Vermont (hence the provisional state rank), its status warrants additional investigation.
State: S3?, Species of Greatest Conservation Need
June 3 – August 23