]> NEBC barcode-00872798 United States of America Massachusetts Boston Basin Ecoregion: Mystic River Watershed. Middlesex Fells Reservation, trail at end of Quarry Road, at base of east-facing cliff near Intervale Brook, GPS 42.4372N, 71.1051W Equisetum hyemale var. affine (Engelmann) A. A. Eaton (Engelmann) A. A. Eaton 2017-05-16 16:47:00 W. T. Kittredge