Much like the less-dissected phase of no. 8 [Botrychium dissectum Spreng.], but the persistently green, 2–3 times pinnate blade with mostly obtuse or rounded ultimate segments, the major segments tending to be ovate; 2n=90. Rich, moist woods and swamps; N.B. to Ont. and Minn., s. to N.C. and Ind. Aug.–Nov.