Polystichum imbricans |
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imbricate sword-fern, narrow-leaf sword fern, rock sword-fern |
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Stems | ascending to erect. |
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Leaves | erect to arching back at tip, 2–8 dm; bulblets absent. |
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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. |
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Indusia | entire to sharply dentate. |
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Spores | dark brown. |
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Polystichum imbricans |
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Distribution |
CA; OR; WA; BC; only in the flora
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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.) |
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Key |
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Source | FNA vol. 2. | ||||
Parent taxa | Dryopteridaceae > Polystichum | ||||
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Synonyms | Aspidium munitum var. imbricans, P. munitum subsp. imbricans, P. munitum var. imbricans | ||||
Name authority | (D. C. Eaton) D. H. Wagner: Pteridologia 1: 50. (1979) | ||||
Web links |
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