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imbricate sword fern

Lemmon's holly fern, Shasta sword fern

Stems

ascending or decumbent.

Leaves

small; up to 35 cm; bulbils absent.

Petioles

up to 25% leaf length; chaffy near the base;

scales very sparse distally; small and sparse along the rachis.

Blades

2-pinnate, narrowly lanceolate, not much narrowed at base;

microscales linear; sparse on the ab- and adaxial costa.

Pinnae

ovate; up to 2 cm long; lowest pinnae often remote, not overlapping;

distal pinnae overlapping, twisted out of plane with pinnules folded again creating a complex 3-dimensional structure; pinnules ovate; pinnatifid with irregularly lobed or toothed margins;

teeth acute or obtuse, not spine-tipped;

basal (acroscopic) pinnule not enlarged.

Sori

with indusial margins more or less entire.

2n

=82.

Polystichum imbricans

Polystichum lemmonii

Distribution
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[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

[Species with one variety or subspecies in Oregon.]

Rocky (often serpentine) slopes. 1300–2500 m. BW, Sisk. CA, ID, WA; north to British Columbia. Native.

The combination of its small size and two-pinnate leaves with complex folding makes this species distinctive among all other Oregon members of the genus.

Source Flora of Oregon, volume 1 Flora of Oregon, volume 1, page 76
Duncan Thomas
Sibling taxa
P. andersonii, P. andersonii x Polystichum munitum, P. californicum, P. californicum x Polystichum munitum, P. kruckebergii, P. lemmonii, P. lonchitis, P. munitum, P. scopulinum
P. andersonii, P. andersonii x Polystichum munitum, P. californicum, P. californicum x Polystichum munitum, P. imbricans, P. kruckebergii, P. lonchitis, P. munitum, P. scopulinum
Subordinate taxa
P. imbricans ssp. imbricans
Synonyms Polystichum mohrioides, Polystichum mohrioides var. lemmonii
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