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Ophioglossum engelmannii Prantl  
Family: Ophioglossaceae
[Ophioglossum vulgatum f. engelmannii (Prantl) Clute, moreOphioglossum vulgatum var. engelmannii (Prantl) G.Tilton]
Ophioglossum engelmannii image
  • FNA
  • Gleason & Cronquist
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Warren H. Wagner Jr.
Florence S. Wagner in Flora of North America (vol. 2)
Roots to 25 per plant, tan to brown, 0.5-1.5mm diam., straight, producing proliferations. Stem upright, to 1.5 cm, 4 mm diam., leaves 1-2 per stem. Trophophore stalk to 0.1 cm, 0.01 times length of blade. Trophophore blade erect to spreading, commonly ± folded when alive, uniformly pale green throughout when dried, dull, ovate to ovate-lanceolate, 10 × 4.5 cm, firm, herbaceous, base narrowed abruptly, apex with apiculum to 0.8 mm; venation complex-reticulate, veinlets forming numerous, very tiny, secondary areoles within the major areoles. Sporophores arising at ground level, 1.3-2.5 times as long as trophophore; sporangial clusters 2-4 × 0.13-0.31 cm, pairs of sporangia 20-40, apiculum 0-1.3 mm. Leaves appearing early-late spring, often with second flush later in season following summer rains. Mostly in soil over limestone in open fields, pastures, and cedar glades; 50-1000 m; Ala., Ariz., Ark., Fla., Ga., Ill., Ind., Kans., Ky., La., Miss., Mo., Ohio, Okla., N.Mex., N.C., Tenn., Tex., Va., W.Va.; Mexico; Central America.
Vascular plants of NE US and adjacent Canada
Bases of old lvs persisting on the rhizomes; lvs often 2 or more, the blade usually somewhat trough-shaped in life, acute at each end, apiculate, the veins forming areoles that enclose many smaller areoles and also some free veinlets; otherwise much like O. vulgatum. Woods, pastures, and ledges, mostly in calcareous soils; nw. Va. to s. Ill. and e. Kans., s. to Fla., Ariz., and Mex. Spr.-early summer.

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.
Ophioglossum engelmannii
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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.