Flora of North America species comparison

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

dimorphic, 35–70 × 8–12 cm;

fertile leaves dying back in winter;

sterile leaves several, small, green through winter, forming "rosette." Petiole 1/4–1/3 length of leaf, scaly at least at base;

scales scattered, tan.

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

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

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

green, narrowly lanceolate or with parallel sides, pinnate-pinnatifid, 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 and perpendicular to it, deltate;

basal pinnae deltate, somewhat reduced, basal pinnules longer than adjacent pinnules, basal basiscopic pinnule and basal acroscopic pinnule equal;

pinnule margins distantly serrate, with spiny teeth.

lacking glands.

lacking glands.

midway between midvein and margin of segments.

midway between midvein and margin of segments.

= 164.

= 164.