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Ophioglossum petiolatum Hooker
LONGSTEM ADDERSTONGUE
Stalked adders tongue

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Ophioglossum petiolatum
© Copyright Bobby Hattaway 2011 · 5
Ophioglossum petiolatum

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Ophioglossum petiolatum
© Copyright Bobby Hattaway 2011 · 5
Ophioglossum petiolatum
Ophioglossum petiolatum
© Copyright Bobby Hattaway 2011 · 5
Ophioglossum petiolatum

Ophioglossum petiolatum
© Copyright Bobby Hattaway 2011 · 5
Ophioglossum petiolatum
Ophioglossum petiolatum
© Copyright Bobby Hattaway 2011 · 5
Ophioglossum petiolatum

Ophioglossum petiolatum
© Copyright Bobby Hattaway 2011 · 5
Ophioglossum petiolatum
Ophioglossum petiolatum, Longstem adderstongue
© Nancy Lowe, 2008-2012 · 1
Ophioglossum petiolatum, Longstem adderstongue

Ophioglossum petiolatum, Longstem adderstongue
© Nancy Lowe, 2008-2012 · 1
Ophioglossum petiolatum, Longstem adderstongue
Ophioglossum petiolatum, Longstem adderstongue
© John Pickering, 2004-2019 · 1
Ophioglossum petiolatum, Longstem adderstongue

Ophioglossum petiolatum, Longstem adderstongue
© John Pickering, 2004-2019 · 1
Ophioglossum petiolatum, Longstem adderstongue
Ophioglossum petiolatum, Longstem adderstongue
© John Pickering, 2004-2019 · 1
Ophioglossum petiolatum, Longstem adderstongue

Ophioglossum petiolatum, Longstem adderstongue
© John Pickering, 2004-2019 · 1
Ophioglossum petiolatum, Longstem adderstongue
Ophioglossum petiolatum, Longstem adderstongue
© John Pickering, 2004-2019 · 1
Ophioglossum petiolatum, Longstem adderstongue

Ophioglossum petiolatum, closed
© George Yatskievych, 2006-2011 · 1
Ophioglossum petiolatum, closed
Ophioglossum petiolatum, open
© George Yatskievych, 2006-2011 · 1
Ophioglossum petiolatum, open
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5. Ophioglossum petiolatum Hooker, Exot. Fl. 1: 56. 1823.

Stalked adder's-tongue

Ophioglossum petiolatum

Credit: Harvard University Herbaria

Roots dark brown, to 8 per plant, 0.8-1.3 mm diam., producing proliferations. Stem upright, 0.3-1 cm, 1.5-2.5mm diam., 2-3 leaves per stem. Trophophore stalk 0-3mm, 0-0.1 times length of blade. Trophophore blade erect to spreading, usually plane or nearly so when alive, gray-green, dull, ovate to trowel-shaped, to 6 × 3cm, fleshy, cuneate to truncate to nearly cordate at base, contracted gradually to acute apex, apiculum mostly absent; venation coarse, reticulate, areoles large with few free or anastomosing included veinlets. Sporophores arising at ground level, 0.8-7 times length of trophophore; sporangial clusters to 4 × 0.35 cm, with up to 30 pairs of sporangia, apiculum 0.3-1.2 mm.

Leaves appearing during wet periods. Plants sometimes weedy in lawns, ditches, and around buildings; 0-90m; introduced; Ala., Ark., Fla., Ga., La., Miss., Mo., N.C., Okla., S.C., Tex., Va.; West Indies; Mexico; n South America; Asia; Pacific Islands.

Ophioglossum petiolatum grows readily in pots, making it suitable for botany instruction. Earliest records in North America date from 1900 to 1930, suggesting that it is probably introduced.

Updated: 2020-11-28 09:14:32 gmt
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