Difference between revisions of "Najas minor"
Flora Pedemontana 2: 221. 1785.
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|place=2: 221. 1785 | |place=2: 221. 1785 | ||
|year=1785 | |year=1785 | ||
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| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=W | ||
| + | |label=Weedy | ||
| + | }}{{Treatment/ID/Special_status | ||
| + | |code=I | ||
| + | |label=Introduced | ||
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|basionyms= | |basionyms= | ||
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|elevation=0–500 m | |elevation=0–500 m | ||
|distribution=Ala.;Del.;Fla.;Ga.;Ill.;Ind.;Ky.;La.;Mass.;Mich.;Miss.;Mo.;N.Y.;N.C.;Ohio;Okla.;Pa.;S.C.;Tenn.;Vt.;Va.;W.Va.;Eurasia;Africa. | |distribution=Ala.;Del.;Fla.;Ga.;Ill.;Ind.;Ky.;La.;Mass.;Mich.;Miss.;Mo.;N.Y.;N.C.;Ohio;Okla.;Pa.;S.C.;Tenn.;Vt.;Va.;W.Va.;Eurasia;Africa. | ||
| + | |introduced=true | ||
|discussion=<p>Pistillate flowers in distal to proximal axils, 2.2 mm; styles 1–1.2 mm; stigmas 2-lobed. Seeds slightly recurved, purplish, fusiform, 1.5–3 × 0.5–0.7 mm, apex with style situated at center; testa dull, 3 cell layers thick, pitted; aeroleareoles regularly arranged in ca. 15 longitudinal rows, ladderlike, 4-angled, broader than long, end walls not raised. 2n = 24.</p><!-- | |discussion=<p>Pistillate flowers in distal to proximal axils, 2.2 mm; styles 1–1.2 mm; stigmas 2-lobed. Seeds slightly recurved, purplish, fusiform, 1.5–3 × 0.5–0.7 mm, apex with style situated at center; testa dull, 3 cell layers thick, pitted; aeroleareoles regularly arranged in ca. 15 longitudinal rows, ladderlike, 4-angled, broader than long, end walls not raised. 2n = 24.</p><!-- | ||
--><p><i>Najas minor</i>, with its mature leaves recurved and with its aeroleareoles broader than long and arranged in longitudinal rows like the rungs of a ladder, is one of the more distinctive species of <i>Najas</i>. Young sterile individuals resemble <i>N. gracillima</i>, however.</p> | --><p><i>Najas minor</i>, with its mature leaves recurved and with its aeroleareoles broader than long and arranged in longitudinal rows like the rungs of a ladder, is one of the more distinctive species of <i>Najas</i>. Young sterile individuals resemble <i>N. gracillima</i>, however.</p> | ||
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name=Najas minor | name=Najas minor | ||
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|authority=Allioni | |authority=Allioni | ||
|rank=species | |rank=species | ||
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|publication title=Flora Pedemontana | |publication title=Flora Pedemontana | ||
|publication year=1785 | |publication year=1785 | ||
| − | |special status= | + | |special status=Weedy;Introduced |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V22/V22_267.xml |
|genus=Najas | |genus=Najas | ||
|species=Najas minor | |species=Najas minor | ||
Latest revision as of 20:30, 5 November 2020
Stems profusely branched near apex distally, 11–120 cm × 0.2–1 mm; internodes 0.5–5.8 cm, without prickles abaxially. Leaves usually recurved with age, 0.5–3.4 cm, stiff in age; sheath 1–3 mm wide, apex truncate to auriculate; blade 0.1–1.2 mm wide, margins conspicuously serrulate, teeth 7–15 per side, apex acute, with 1–2 teeth, teeth multicellular; midvein without prickles abaxially. Flowers 1–2 per axil, staminate and pistillate on same plant. Staminate flowers in distal axils, 1.9–2.2 mm; involucre 2-lobed, beaks 0.4–2.1 mm; anther 1-loculed, 0.3 mm.
Phenology: Flowering summer–fall.
Habitat: Ponds, lakes, and slow- moving streams
Elevation: 0–500 m
Distribution
Introduced; Ala., Del., Fla., Ga., Ill., Ind., Ky., La., Mass., Mich., Miss., Mo., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn., Vt., Va., W.Va., Eurasia, Africa.
Discussion
Pistillate flowers in distal to proximal axils, 2.2 mm; styles 1–1.2 mm; stigmas 2-lobed. Seeds slightly recurved, purplish, fusiform, 1.5–3 × 0.5–0.7 mm, apex with style situated at center; testa dull, 3 cell layers thick, pitted; aeroleareoles regularly arranged in ca. 15 longitudinal rows, ladderlike, 4-angled, broader than long, end walls not raised. 2n = 24.
Najas minor, with its mature leaves recurved and with its aeroleareoles broader than long and arranged in longitudinal rows like the rungs of a ladder, is one of the more distinctive species of Najas. Young sterile individuals resemble N. gracillima, however.
Selected References
None.