Difference between revisions of "Isoëtes riparia"
Flora 29: 178. 1846.
Common names: Shore quillwort isoète riparien
Synonyms: Isoëtes canadensis (Engelmann) A. A. Eaton Isoëtes saccharata Engelmann
Treatment appears in FNA Volume 2.
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|name=Isoëtes canadensis | |name=Isoëtes canadensis | ||
|authority=(Engelmann) A. A. Eaton | |authority=(Engelmann) A. A. Eaton | ||
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|name=Isoëtes saccharata | |name=Isoëtes saccharata | ||
|authority=Engelmann | |authority=Engelmann | ||
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|hierarchy=Isoëtaceae;Isoëtes;Isoëtes riparia | |hierarchy=Isoëtaceae;Isoëtes;Isoëtes riparia | ||
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>usually aquatic, occasionally emergent. <b>Rootstock</b> nearly globose, 2-lobed. <b>Leaves</b> evergreen, bright green, pale toward base, spirally arranged, often twisted, to 35(–50) cm, pliant, gradually tapering to tip. <b>Velum</b> covering less than 1/2 of sporangium. <b>Sporangium</b> wall brown-streaked to completely brown. <b>Megaspores</b> white, 450-650 μm diam., cristate with isolated and branching, lamellate ridges; girdle obscure. <b>Microspores</b> gray to light brown in mass, 30–40 μm, tuberculate. <b>2n</b> = 44.</span><!-- |
-->{{Treatment/Body | -->{{Treatment/Body | ||
| + | |phenology=Spores mature late summer. | ||
|habitat=Margins of lakes, ponds, and streams, tidal shores and estuaries | |habitat=Margins of lakes, ponds, and streams, tidal shores and estuaries | ||
|distribution=Calcareous to slightly acidic substrates in fresh;usually oligotrophic;water;Ont.;Que.;Conn.;Del.;Fla.;Maine;Md.;Mass.;N.H.;N.J.;N.Y.;N.C.;Pa.;R.I.;S.C.;Vt.;Va.;W.Va. | |distribution=Calcareous to slightly acidic substrates in fresh;usually oligotrophic;water;Ont.;Que.;Conn.;Del.;Fla.;Maine;Md.;Mass.;N.H.;N.J.;N.Y.;N.C.;Pa.;R.I.;S.C.;Vt.;Va.;W.Va. | ||
| − | |discussion=<p>Megaspore morphology, electrophoretic profiles of leaf enzymes, and chromosome number provide evidence that Isoëtes riparia is an allotetraploid, formed by chromosome doubling in I. x eatonii, the primary diploid hybrid between I. echinospora and I. engelmanii. The considerable variation in leaf and spore morphology possibly results from multiple allotetraploid origins.</p><!-- | + | |discussion=<p>Megaspore morphology, electrophoretic profiles of leaf enzymes, and chromosome number provide evidence that <i>Isoëtes riparia</i> is an allotetraploid, formed by chromosome doubling in I. x eatonii, the primary diploid hybrid between <i>I. echinospora</i> and I. engelmanii. The considerable variation in leaf and spore morphology possibly results from multiple allotetraploid origins.</p><!-- |
| − | --><p>Isoëtes riparia hybridizes with I. echinospora [ = I. x dodgei A. A. Eaton]; I. engelmannii [ = I. x brittonii Brunton & W. C. Taylor]; I. lacustris [ = I. x jeffreyi D. M. Britton & Brunton); and I. tuckermanii.</p> | + | --><p><i>Isoëtes riparia</i> hybridizes with <i>I. echinospora</i> [ = I. x dodgei A. A. Eaton]; <i>I. engelmannii</i> [ = I. x brittonii Brunton & W. C. Taylor]; <i>I. lacustris</i> [ = I. x jeffreyi D. M. Britton & Brunton); and <i>I. tuckermanii</i>.</p> |
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name=Isoëtes riparia | name=Isoëtes riparia | ||
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|authority=Engelmann ex A. Braun | |authority=Engelmann ex A. Braun | ||
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|family=Isoëtaceae | |family=Isoëtaceae | ||
| + | |phenology=Spores mature late summer. | ||
|habitat=Margins of lakes, ponds, and streams, tidal shores and estuaries | |habitat=Margins of lakes, ponds, and streams, tidal shores and estuaries | ||
|distribution=Calcareous to slightly acidic substrates in fresh;usually oligotrophic;water;Ont.;Que.;Conn.;Del.;Fla.;Maine;Md.;Mass.;N.H.;N.J.;N.Y.;N.C.;Pa.;R.I.;S.C.;Vt.;Va.;W.Va. | |distribution=Calcareous to slightly acidic substrates in fresh;usually oligotrophic;water;Ont.;Que.;Conn.;Del.;Fla.;Maine;Md.;Mass.;N.H.;N.J.;N.Y.;N.C.;Pa.;R.I.;S.C.;Vt.;Va.;W.Va. | ||
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|publication year=1846 | |publication year=1846 | ||
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|genus=Isoëtes | |genus=Isoëtes | ||
|species=Isoëtes riparia | |species=Isoëtes riparia | ||
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Latest revision as of 20:21, 5 November 2020
Plants usually aquatic, occasionally emergent. Rootstock nearly globose, 2-lobed. Leaves evergreen, bright green, pale toward base, spirally arranged, often twisted, to 35(–50) cm, pliant, gradually tapering to tip. Velum covering less than 1/2 of sporangium. Sporangium wall brown-streaked to completely brown. Megaspores white, 450-650 μm diam., cristate with isolated and branching, lamellate ridges; girdle obscure. Microspores gray to light brown in mass, 30–40 μm, tuberculate. 2n = 44.
Phenology: Spores mature late summer.
Habitat: Margins of lakes, ponds, and streams, tidal shores and estuaries
Distribution
Calcareous to slightly acidic substrates in fresh, usually oligotrophic, water, Ont., Que., Conn., Del., Fla., Maine, Md., Mass., N.H., N.J., N.Y., N.C., Pa., R.I., S.C., Vt., Va., W.Va.
Discussion
Megaspore morphology, electrophoretic profiles of leaf enzymes, and chromosome number provide evidence that Isoëtes riparia is an allotetraploid, formed by chromosome doubling in I. x eatonii, the primary diploid hybrid between I. echinospora and I. engelmanii. The considerable variation in leaf and spore morphology possibly results from multiple allotetraploid origins.
Isoëtes riparia hybridizes with I. echinospora [ = I. x dodgei A. A. Eaton]; I. engelmannii [ = I. x brittonii Brunton & W. C. Taylor]; I. lacustris [ = I. x jeffreyi D. M. Britton & Brunton); and I. tuckermanii.
Selected References
None.
Lower Taxa
None.