Polystichum imbricans |
Polystichum lonchitis |
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imbricate sword fern |
Northern holly fern |
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Stems | erect. |
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Leaves | to 50 cm but usually smaller, 10 cm or even shorter in specimens from exposed sites; bulbils absent. |
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Petiole | short; less than 20% of the leaf length; leaves sometimes subsessile; chaffy scales sparse to dense on the petiole and rachis. |
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Blades | 1-pinnate; very narrow; more or less linear; to approximately 45 × 5 cm; widest in the mid-region and tapered to apex and base; microscales narrow on abaxial surface; adaxial surface glabrous. |
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Pinnae | oblonglanceolate, slightly falcate; up to 4 × 1.5 cm; lowest pinnae often broadly triangular, rarely overlapping; in 1 plane; margins regularly spiny-toothed; spines conspicuous, spreading or angled forward, acroscopic auricle large, broadly triangular; ovate, bearing several spreading spines. |
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Sori | with irregularly toothed indusia. |
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2n | =82. |
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Polystichum imbricans |
Polystichum lonchitis |
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Distribution | ||
Discussion | [Species with one variety or subspecies in Oregon.] |
Shaded, rocky or occasionally wet places. 300–3000 m. BR, BW, Casc, ECas, Sisk. CA, ID, NV, WA; north to AK, circumboreal. Native. |
Source | Flora of Oregon, volume 1 | Flora of Oregon, volume 1, page 76 Duncan Thomas |
Sibling taxa | ||
Subordinate taxa | ||
Web links |
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