Polystichum imbricans |
Polystichum lemmonii |
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imbricate sword fern |
Lemmon's holly fern, Shasta sword fern |
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Stems | ascending or decumbent. |
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Leaves | small; up to 35 cm; bulbils absent. |
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Petioles | up to 25% leaf length; chaffy near the base; scales very sparse distally; small and sparse along the rachis. |
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Blades | 2-pinnate, narrowly lanceolate, not much narrowed at base; microscales linear; sparse on the ab- and adaxial costa. |
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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. |
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Sori | with indusial margins more or less entire. |
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2n | =82. |
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Polystichum imbricans |
Polystichum lemmonii |
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Distribution | ||
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 | ||
Subordinate taxa | ||
Synonyms | Polystichum mohrioides, Polystichum mohrioides var. lemmonii | |
Web links |
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