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D. amurensis resources
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Dryopteris amurensis (Milde) H. Christ
Etymology Amurensis refers to the area of the Amur River, which is the boundry between Manchuria and Russia.
Description Rhizome: short-creeping, scales.
Frond: 50 cm high by 20 cm wide, evergreen, monomorphic, blade/stipe ratio: 2:3.
Stipe: grooved, darker base, scales sparse, ovate, long, pale brown, vascular bundles: 3-7 in a c-shaped pattern.
Blade: 3-pinnate at base, pentagonal, membranous, small bullate scales on underside.
Pinnae: anadromous, the lowest pinnae almost the size of the remainder of the blade; pinnules basiscopic pinnule of lowest pinnae very long; costae grooved above, continuous from rachis to costae; segments oblong-ovate; margins pinnately incised or lobed, soft-spiny; veins free, forked.
Sori: round, medial on lobes, on upper half of lower veinlets, indusium: reniform, at a sinus, sporangia: brownish.
Culture Habitat: on humus-rich floor of dense mountain, coniferous forests often in subalpine zone. Distribution: eastern Siberia, northeastern China, Japan, Korea. Hardy to -30C, USDA Zone 4.
Synonyms
Aspidium spinulosum var. amurense Milde
Leptorumohra amurensis (Christ) Tzvelev
Nephrodium amurense B. Fedtschenko
Dryopteris amurensis
Dryopteris amurensis.  Illustration from The Cultivated Species of the Fern Genus Dryopteris in the United States, Barbara Joe Hoshizaki and Kenneth A. Wilson, American Fern Journal, 89, 1, (1999), with permission.
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