Difference between revisions of "Dryopteris cristata"
Manual 631. 1848.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Leaves </b>dimorphic, 35–70 × 8–12 cm; fertile leaves dying back in winter; sterile leaves several, small, green through winter, forming "rosette." Petiole 1/4–1/3 length of leaf, scaly at least at base; scales scattered, tan. <b>Blade</b> green, narrowly lanceolate or with parallel sides, pinnate-pinnatifid, not glandular. <b>Pinnae</b> of fertile leaves twisted out of plane of blade and perpendicular to it, deltate; basal pinnae deltate, somewhat reduced, basal pinnules longer than adjacent pinnules, basal basiscopic pinnule and basal acroscopic pinnule equal; pinnule margins distantly serrate, with spiny teeth. <b>Sori</b> midway between midvein and margin of segments. <b>Indusia</b> lacking glands. <b>2n</b> = 164.</span><!-- |
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|publication year=1848 | |publication year=1848 | ||
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|genus=Dryopteris | |genus=Dryopteris | ||
|species=Dryopteris cristata | |species=Dryopteris cristata | ||
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Revision as of 14:22, 27 July 2019
Leaves dimorphic, 35–70 × 8–12 cm; fertile leaves dying back in winter; sterile leaves several, small, green through winter, forming "rosette." Petiole 1/4–1/3 length of leaf, scaly at least at base; scales scattered, tan. Blade green, narrowly lanceolate or with parallel sides, pinnate-pinnatifid, not glandular. Pinnae of fertile leaves twisted out of plane of blade and perpendicular to it, deltate; basal pinnae deltate, somewhat reduced, basal pinnules longer than adjacent pinnules, basal basiscopic pinnule and basal acroscopic pinnule equal; pinnule margins distantly serrate, with spiny teeth. Sori midway between midvein and margin of segments. Indusia lacking glands. 2n = 164.
Habitat: Swamps, swampy woods, or open shrubby wetlands
Elevation: 0–1200 m
Distribution
Alta., B.C., Man., N.B., Nfld., N.S., Ont., P.E.I., Que., Sask., Ala., Conn., Del., Ill., Ind., Iowa, Maine, Md., Mass., Mich., Minn., Mont., Nebr., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Pa., R.I., Tenn., Vt., Va., W.Va., Wis., Europe.
Discussion
Dryopteris cristata is believed to be an allotetraploid derived from D. ludoviciana and an unknown diploid called " D. semicristata " by W. H. Wagner Jr. (1971). This ancestral taxon could have been either North American or Eurasian and may have become extinct during the last glaciation (T. J. Carlson and W. H. Wagner Jr. 1982). Dryopteris cristata hybridizes with five species; these hybrids can be identified by the narrow blades and deltate proximal pinnae.
Selected References
None.