Flora of North America species comparison

monomorphic, dying back in winter, 65–120 × 15–30 cm.

dimorphic, 45–100 × 12–20 cm;

fertile leaves dying back in winter;

sterile leaves 1–several, smaller, green through winter.

1/3 length of leaf, scaly at least at base;

scales scattered, dark brown or tan with dark central stripe.

1/4–1/3 length of leaf, scaly at least at base;

scales scattered, tan, sometimes with dark brown center.

green, ovate-lanceolate, gradually tapering to tip, pinnate-pinnatifid, herbaceous, not glandular.

green, lanceolate, with nearly parallel sides, pinnate-pinnatifid, herbaceous, not glandular.

± in plane of blade, lanceolate-ovate;

basal pinnae linear-oblong, much reduced, basal pinnules longer than adjacent pinnules, basal basiscopic pinnule and basal acroscopic pinnule equal;

pinnule margins crenately toothed.

of fertile leaves twisted out of plane of blade but not fully perpendicular to it, narrowly elongate-deltate;

basal pinnae narrowly elongate-deltate, much reduced;

basal pinnules longer than or equal to adjacent pinnules, basal basiscopic pinnule and basal acroscopic pinnule equal;

pinnule margins serrate or biserrate, with spiny teeth.

lacking glands.

lacking glands.

midway between midvein and margin of segments.

midway between midvein and margin of segments.

= 164.

= 246.