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Fronds with leaflets

Osmunda claytoniana

Common Name: Interrupted Fern
Family: Osmundaceae


Description:  This annual fern is named for its brown fertile leaflets which interrupt the larger green sterile leaflets on larger fronds.  
Leaves: 
There are a combination of two leaflets on each frond. There are small brown fertile leaflets and larger green sterile leaflets. The larger green leaflets have distinctive rounded edges.
Seeds:
 
They are spores located on brown fertile leaflets
Stem:  The petioles are covered in wooly hairs which decrease with age.
Branching Pattern:
   symmetric clump
Height:  Fronds can be 2-4 feet long
Conditions/Habitat/Kind of Forest:  It can grown in semi shade to no shade, but it must have moist soil. It is found in woods, roadsides, swamps and low prairies. 
Known Wildlife Interactions: Pollinated by insects
Range:  North America, Newfoundland south to Florida. Naturalized in Ireland. Also found in east Asia
Conservation Status-US/ World Wide:  Not threatened in U.S. or globally.
Uses (Human): No known usage.

References:

Connecticut Wildflowers.  January 20, 2006.  Connecticut Botanical Society.  Accessed:  January 20, 2006. <http://www.ct-botanical-society.org/galleries/polygonumsagi.html>

Plants for a Future.  June 2004.  Accessed: January 20, 2006.  <http://www.pfaf.org/database/plants.php?Polygonum+sagittatum>

The Pennsylvania Flora Project.  Botany Department, Morris Arboretum of the University of Pennsylvania.  Accessed:  January 20, 2006. <http://www.paflora.org>

Chadde, Steve W. A Great Lakes Wetland Flora. Pocketflora Press. 2002. pg.67

IUCN Red List of Threatened Species <http://www.iucnredlist.org>

This page was created by: A Coiro, Muhlenberg College
Photos by: L. Rosenberg, edited by N. Smith
Last updated 04/25/06