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Sceptridium biternatum (Savigny) Lyon   (redirected from: Botrychium biternatum (Sav.) Underw.)
Family: Ophioglossaceae
[Botrychium biternatum (Sav.) Underw., moreBotrychium dissectum var. tenuifolium (Underw.) Farw., Botrychium fumariae Spreng., Botrychium fumarianum Sm. ex Rees, Botrychium fumarioides Willd., Botrychium obliquum var. tenuifolium (Underw.) Gilbert, Botrychium tenuifolium Underw., Botrychium ternatum f. tenuifolium (Underw.) Clute, Botrychium ternatum var. daedaleum Christ, Osmunda biternata Savigny, Sceptridium tenuifolium (Underw.) Lyon, Sceptridium ternatum var. tenuifolium (Underw.) Clute]
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Warren H. Wagner Jr.
Florence S. Wagner in Flora of North America (vol. 2)
Trophophore stalk 4--20 cm, 2--2.5 times length of trophophore rachis; blade green to dark green, plane, 2--3-pinnate, to 18 × 28 cm, herbaceous. Pinnae to 7 pairs, usually remote, horizontal, distance between 1st and 2d pinnae not or slightly more than between 2d and 3d pairs, undivided except in proximal 2/3--1/2. Pinnules elongate, obliquely lanceolate to narrowly lanceolate, margins nearly parallel and finely denticulate, apex short-acuminate, venation pinnate. Sporophores 1--2-pinnate, 2--3 times length of trophophore. 2 n =90. Leaves green over winter, sporophores seasonal, new leaves appearing in late spring--early summer. Frequent in low woods and brushy fields; 0--600 m; Ala., Ark., Del., Fla., Ga., Ill., Ind., Ky., La., Md., Miss., Mo., N.J., N.C., Ohio, Okla., Pa., S.C., Tenn., Tex., Va., W.Va. Botrychium biternatum often grows with B . dissectum and B . jenmanii . The name B . biternatum was misapplied by L.Underwood to B . lunarioides (W.H. Wagner Jr. 1961).

Vascular plants of NE US and adjacent Canada
Blade not strongly dissected, mostly bipinnate, the terminal segment of the principal divisions tending to be more elongate and less divided than the other segments; major lateral segments tending to be oblong; ultimate segments ±cuneate at base; otherwise much like the less-dissected forms of no. 8 [Botrychium dissectum Spreng.]. 2n=90. Woods, swamps, and old fields; se. U.S., n. to Md., Ind., and Mo. Sept.-Nov. (B. dissectum var. tenuifolium)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
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The PCC, and this data portal, were made possible by funding from the National Science Foundation’s Advancing Digitization of Biological Collections (ADBC) program, grant numbers 1802504, 1802352, 1802134, 1802033, 1802270, 1802255, 1802239, 1802446, 1802305.
The pteridoportal taxonomic thesaurus is based on the Checklist of Ferns and Lycophytes of the World, generously provided by Michael Hassler.