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Osmunda regalis L.  
Family: Osmundaceae
[Aphyllocalpa regalis (L.) Cav., moreOsmunda brayeri Watelet, Osmunda leschenaultii Wall., Osmunda longifolia (C. Presl) A. Bobrov, Osmunda plumieri Tausch, Osmunda regalis var. longifolia C. Presl, Osmunda spicata L., Struthiopteris regalis (L.) Bernh.]
Osmunda regalis image
Morton Arboretum
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  • Gleason & Cronquist
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R. David Whetstone
T. A. Atkinson in Flora of North America (vol. 2)
Osmunda regalis var. regalis is widely distributed in Europe and Asia and is widely cultivated as an ornamental.

Vascular plants of NE US and adjacent Canada
Lvs mostly 5-18 dm; petiole glabrous; blade bipinnate, broadly ovate, to 5.5 dm wide; pinnae 5-7 pairs, subopposite, the lowest slightly reduced; pinnules alternate, 7- 10 to a side, oblong, to 7 נ2.3 cm, sessile or nearly so, rounded and oblique at the base, obtuse, serrulate, finely and closely veined; fertile pinnae borne at the ends of some of the blades, several pairs, the larger segments oblong, 6-11 נ2-3 mm, at first greenish, eventually brownish; 2n=44. Swamps and moist places, mostly in acid soil; circumboreal, in Amer. from Nf. to Sask., s. to Fla., Tex., and trop. Amer. Spring-early summer. The Amer. plant is var. spectabilis (Willd.) A. Gray.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
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The PCC, and this data portal, were made possible by funding from the National Science Foundation’s Advancing Digitization of Biological Collections (ADBC) program, grant numbers 1802504, 1802352, 1802134, 1802033, 1802270, 1802255, 1802239, 1802446, 1802305.
The pteridoportal taxonomic thesaurus is based on the Checklist of Ferns and Lycophytes of the World, generously provided by Michael Hassler.