by Nathaniel Lord Britton & Addison Brown, An Illustrated Flora of the Northern United States… (1913)
“ In wet woods, swamps and low grounds, Newfoundland to Minnesota, the Gulf states and New Mexico. Also in Mexico, Brazil, the West Indies and eastern Asia. Forms occur with leaves variously intermediate between the fertile and sterile. ”
by Nathaniel Lord Britton & Addison Brown, An Illustrated Flora of the Northern United States… (1913)
“ Rootstock very large, widely creeping, bearing a circular cluster of sterile leaves with one or more fertile ones within. Stipes 1° or more long, clothed with ferruginous tomentum when young, glabrous with age. Sterile blades 1°–5° long, oblong-lanceolate, deeply bipinnatifid, the pinnae linear-lanceolate, deeply pinnatifid into oblong obtuse segments, the margins usually entire. ”
