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FNA | Family List | FNA Vol. 2 | Osmundaceae

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.

1 Fertile leaves with pinnae monomorphic, all spore-bearing; tuft of hairs persistent on abaxial surface of pinnae near base.   1 Osmunda cinnamomea
+ Fertile leaves with pinnae dimorphic, some spore-bearing, some not; tuft of hairs absent on abaxial surface of pinnae near base.   (2)
2 (1) Sterile leaves 2-pinnate with pinnules sessile.   4 Osmunda ruggii
+ Sterile leaves pinnate-pinnatifid or 2-pinnate with pinnules stalked.   (3)
3 (2) Fertile pinnae apical, sterile leaves 2-pinnate.   3a var. spectabilis
+ Fertile pinnae medial, sterile leaves pinnate-pinnatifid.   2 Osmunda claytoniana

Lower Taxa


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