Asplenium platyneuron (L.) Oakes
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Aspleniaceae
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Scientific Name
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Description
Species Description - Rhizome 2–3.5 mm thick, the few linear-subulate black scales 2.5–4 mm; lvs subdimorphic, 5–50 cm, with dark brown petiole and rachis; sterile blades spreading, 5–10 cm, very shortly petiolate, pinnate, with 15–22 pairs of sessile, alternate, crowded, oblong pinnae 7–10 × 3.5–4.5 mm, these rounded and remotely serrulate, tending to be auriculate at the upper base; fertile lvs few, erect, to 4.5 dm × 6 cm, short-petiolate, the blade linear-oblong, acute, narrowed basally, pinnate, the 30–50 pairs of alternate pinnae less crowded, more linear-oblong (except the reduced, more deltoid lowermost ones), to 3.5 cm × 6 mm, more prominently auriculate at the upper base and sometimes at the lower base as well, mostly serrate, seldom more deeply cleft; 2n=72. Woods, banks, and rocks in circumneutral soil; Que. and Ont. to se. Minn., Kans., and Colo., s. to Fla., Tex., and Ariz.
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Common Names
ebony-spleenwort