Dryopteris clintoniana

(D. C. Eaton) Dowell
Proc. Staten Island Assoc. Arts 1: 64. 1906.
Common names: Clinton's wood fern dryoptère de clinton
Endemic
Basionym: Aspidium cristatum var. clintonianum D. C. Eaton in A. Gray, Manual ed. 5, 665. 1867
Synonyms: Dryopteris cristata var. clintoniana (D. C. Eaton) L. Underwood
Treatment appears in FNA Volume 2.

Leaves dimorphic, 45–100 × 12–20 cm; fertile leaves dying back in winter; sterile leaves 1–several, smaller, green through winter. Petiole 1/4–1/3 length of leaf, scaly at least at base; scales scattered, tan, sometimes with dark brown center. Blade green, lanceolate, with nearly parallel sides, pinnate-pinnatifid, herbaceous, not glandular. Pinnae of fertile leaves twisted out of plane of blade but not fully perpendicular to it, narrowly elongate-deltate; basal pinnae narrowly elongate-deltate, much reduced; basal pinnules longer than or equal to adjacent pinnules, basal basiscopic pinnule and basal acroscopic pinnule equal; pinnule margins serrate or biserrate, with spiny teeth. Sori midway between midvein and margin of segments. Indusia lacking glands. 2n = 246.


Habitat: Swampy woods
Elevation: 50–600 m

Distribution

V2 547-distribution-map.gif

N.B., Ont., Que., Conn., Ind., Maine, Mass., Mich., N.H., N.J., N.Y., Ohio, Pa., R.I., Vt.

Discussion

Dryopteris clintoniana is a North American endemic and an allohexaploid derived from D. cristata and D. goldieana. Dryopteris clintoniana hybridizes with six species. Hybrids can be identified by the fairly narrow blades and elongate-deltate proximal pinnae.

Selected References

None.

Lower Taxa

None.

... more about "Dryopteris clintoniana"
James D. Montgomery +  and Warren H. Wagner Jr. +
(D. C. Eaton) Dowell +
Aspidium cristatum var. clintonianum +
Clinton's wood fern +  and dryoptère de clinton +
N.B. +, Ont. +, Que. +, Conn. +, Ind. +, Maine +, Mass. +, Mich. +, N.H. +, N.J. +, N.Y. +, Ohio +, Pa. +, R.I. +  and Vt. +
50–600 m +
Swampy woods +
Proc. Staten Island Assoc. Arts +
Dryopteris cristata var. clintoniana +
Dryopteris clintoniana +
Dryopteris +
species +