Botrychium minganense is another of the small moonwort
species. The blade is less than 2.5 cm wide and often less than
10 cm tall, although the fertile branch may exceed it significantly
in length, bringing the height of large fertile plants to about
20 cm. Most plants are much smaller. The pinnae of B. minganense
are variable from slightly fan-shaped to nearly round, but are
never broadly fan-shaped nor overlapping as in B. lunaria.
Some intermediate plants of B. minganense, B. lunaria
and B. spathulatum may be difficult to place, however.
B. minganense is widely distributed from Alaska fully
across Canada and south in the Rocky mountains to Arizona, but
is limited to only the northernmost tier of states in the rest
of the U.S. In Wisconsin the range is limited to northern Door
County and to scattered locations in the northwestern counties.
It is listed as a "special concern" species in