Sceptridium oneidense

Sceptridium oneidense, the blunt-lobed grapefern, is a fern species in the family Ophioglossaceae.
Description.
The leaf blades of "S. oneidense" are ternately compound. The spores mature in late fall in panicles that rise above the sterile fronds.
Taxonomy.
At first, "S. oneidense" was considered a variety of "Botrychium dissectum", then a form of it, then possibly a hybrid species. However, after a more detailed study by Wagner in 1961, it was considered its own species.
Distribution and habitat.
"S. oneidense" grows in moist woodlands in eastern United States and Canada from New Brunswick to Ontario and south to North Carolina. In Canada, it is a relatively rare species, usually only found in large groups of "Botrychium obliquum".