Dryopteris clintoniana (D.C. Eaton) Dowell - Clinton's Woodfern


 

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Dryopteris clintoniana - (image 1 of 4)

 

Taxonomy

Family: Dryopteridaceae

 

 

Habitat

Swamps and wet woods.

Associates

 

Distribution

ME and Quebec to WI, south to NY, northern NJ, northern PA, northern OH, and northern IN.

Morphology

Evergreen (fertile leaves dying back in winter) from short, creeping rhizomes. Leaves dimorphic; petiole and rachis eglandular; blade 30-50 cm long, broadest just above the base, abruptly tapered to an acuminate tip; tripinnate-pinnatifid; basal pinnules on the upper and lower sides of the lowest pinna distinctly offset, 4-15 mm apart, the lower one mostly 3-5 times as long and twice as wide as the upper one; ultimate segments spinulose-toothed (spine-tipped); sori not marginal, midway between the midvein and the margins of the ultimate segments; indusia usually eglandular.

Notes

Sori produced June to December

Wetland indicator: FACW

An allohexaploid derived from D. cristata and D. goldiana. It resembles the latter but has more or less upright fertile fronds like D. cristata.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY

 

Montgomery, J.D. and Wagner, W.H. Jr. 1993. Dryopteris. In: Flora of North America North of
Mexico, Vol. 2. Oxford University Press, New York and Oxford.

 

USDA, NRCS. 2002. The PLANTS Database, Version 3.5 (http://plants.usda.gov).

National Plant Data Center, Baton Rouge, LA 70874-4490 USA.

 


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 Michael Hough 2018