Polystichum imbricans |
Polystichum imbricans subsp. curtum |
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imbricate sword-fern, narrow-leaf sword fern, rock sword-fern |
cliff sword fern, narrowleaf swordfern |
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Stems | ascending to erect. |
erect. |
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Leaves | erect to arching back at tip, 2–8 dm; bulblets absent. |
arching at tip, planar, 4–8 dm. |
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Petiole | 1/4–1/3 length of leaf; scales abruptly diminishing in size distally and falling off early but retaining conspicuous tuft of brown scales at base. |
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Blade | linear-lanceolate to linear, 1-pinnate, base not or slightly narrowed. |
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Pinnae | oblong, slenderly lanceolate, or falcate, usually overlapping, in 1 plane or twisted out of plane of blade, 2–4 cm; base oblique, auricles well developed; margins serrulate-spiny with teeth ascending; apex cuspidate or apiculate with subapical teeth smaller than apical tooth; microscales lanceolate to linear with straight or sharply angular projections, sparse, on abaxial surface only. |
narrowly lanceolate, straight to falcate, in same plane as blade, more than 5 times longer than wide, apex acuminate-apiculate. |
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Indusia | entire to sharply dentate. |
entire or margin short-dentate. |
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Spores | dark brown. |
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Polystichum imbricans |
Polystichum imbricans subsp. curtum |
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Habitat | On floor of mixed evergreen forests in light shade | |||||
Elevation | 400–1400 m (1300–4600 ft) | |||||
Distribution |
CA; OR; WA; BC; only in the flora
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CA |
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Discussion | Polystichum imbricans is one of the postulated ancestors of two allopolyploids, P. californicum and P. scopulinum (D. H. Wagner 1979). Relationships to P. munitum are discussed under that species. Subspecies 2. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Polystichum imbricans var. curtum occurs mostly inland in California, and occasionally in the central Sierra Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 2. | FNA vol. 2. | ||||
Parent taxa | Dryopteridaceae > Polystichum | Dryopteridaceae > Polystichum > Polystichum imbricans | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Aspidium munitum var. imbricans, P. munitum subsp. imbricans, P. munitum var. imbricans | P. munitum subsp. curtum | ||||
Name authority | (D. C. Eaton) D. H. Wagner: Pteridologia 1: 50. (1979) | (Ewan) D. H. Wagner: Pteridologia 1: 51. (1979) | ||||
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