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1. Osmunda Linnaeus, Sp. Pl. 2: 1063. 1753; Gen. Pl. ed. 5, 484, 1754.
[Saxon, Osmunder, name for Thor, god of war]
R. David Whetstone
T. A. Atkinson
Plants terrestrial. Stems creeping; tips often somewhat erect. Leaves dimorphic; fertile leaves erect, often notably smaller than sterile leaves in length and width. Blades 1--2-pinnate; pinnae monomorphic to dimorphic, pinnatifid or pinnate.
Species 10 (3 in the flora): nearly worldwide, tropical and temperate regions.
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| 1 |
Fertile leaves with pinnae monomorphic, all spore-bearing; tuft of hairs persistent on abaxial surface of pinnae near base. |
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1 Osmunda cinnamomea |
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Fertile leaves with pinnae dimorphic, some spore-bearing, some not; tuft of hairs absent on abaxial surface of pinnae near base. |
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(2) |
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| 2 (1) |
Sterile leaves 2-pinnate with pinnules sessile. |
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4 Osmunda ruggii |
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Sterile leaves pinnate-pinnatifid or 2-pinnate with pinnules stalked. |
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(3) |
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| 3 (2) |
Fertile pinnae apical, sterile leaves 2-pinnate. |
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3a var. spectabilis |
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Fertile pinnae medial, sterile leaves pinnate-pinnatifid. |
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2 Osmunda claytoniana |
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Lower Taxa
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