Northern Prairie Wildlife Research Center


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Aquatic and Wetland Vascular Plants of the Northern Great Plains

4. Polypodiaceae, the Polypody Family

3. Dryopteris Adans. -- Shield fern

2. Dryopteris cristata (L.) A. Gray -- Crested fern

Fronds somewhat dimorphic, clumped, the outer sterile fronds smaller than the inner fertile ones and persisting longer during winter, the fertile fronds 3-8 dm tall; blades pinnate-pinnatifid to nearly bipinnate, narrowly lanceolate, 2-6 dm long, 7-15 cm wide, acuminate, narrowed at the base; pinnae as in the preceding, except ovate-lanceolate to lanceolate, only once-pinnately lobed; pinnules toothed, mostly 4-15 mm long, 4-7 mm wide, usually spinulose. Jun--Sep. Occurring in the same habitats as the preceding; uncommon; e ND, nc NE; (Circumboreal, in N.Amer. s to VA, AR, NE and ID).
GIF- Distribution Map

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Page Last Modified: Thursday, 03-Aug-2006 11:46:35 EDT
Menlo Park, CA [caww55]