Pteridium aquilinum var. pubescens
Native Ferns ed. 6 91. 1900.
Petiole 10–100 cm. Blade ovate-triangular to nearly pentagonal, 3-pinnate to 3-pinnate-pinnatifid, 30–200 × 15–100 cm; blades, rachises, and costae usually densely covered abaxially with abundant, contorted, lax, spreading hairs. Pinnae (proximal) triangular, distal pinnae oblong; terminal segment of each pinna ca. 4 times longer than wide, longer ultimate segments less than their width apart, ca. 1.5–5 mm wide. Pinnules at nearly 90° angle to costa; fertile ultimate segments adnate or equally decurrent and surcurrent. Outer indusia entire, pilose on margin and surface, hairs like those of axes.
Habitat: In dry to moist woods and open areas in partial to full sun, forming abundant colonies
Elevation: 0–3000 m
Alta., B.C., Alaska, Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., S.Dak., Tex., Utah, Wash., Wyo., Mexico in Baja California, Chihuahua, and Durango.