Difference between revisions of "Lemna obscura"
Illinois Biological Monographs 34: 20. 1965.
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|place=34: 20. 1965 | |place=34: 20. 1965 | ||
|year=1965 | |year=1965 | ||
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| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=W | ||
| + | |label=Weedy | ||
| + | }}{{Treatment/ID/Special_status | ||
| + | |code=F | ||
| + | |label=Illustrated | ||
}} | }} | ||
|basionyms={{Treatment/ID/Basionym | |basionyms={{Treatment/ID/Basionym | ||
|name=Lemna minor var. obscura | |name=Lemna minor var. obscura | ||
|authority=Austin | |authority=Austin | ||
| + | |rank=variety | ||
|publication_title=in A. Gray, Manual ed. | |publication_title=in A. Gray, Manual ed. | ||
|publication_place=5, 479. 1867 | |publication_place=5, 479. 1867 | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Lemna obscura | name=Lemna obscura | ||
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|authority=(Austin) Daubs | |authority=(Austin) Daubs | ||
|rank=species | |rank=species | ||
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|publication title=Illinois Biological Monographs | |publication title=Illinois Biological Monographs | ||
|publication year=1965 | |publication year=1965 | ||
| − | |special status= | + | |special status=Weedy;Illustrated |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V22/V22_253.xml |
|genus=Lemna | |genus=Lemna | ||
|species=Lemna obscura | |species=Lemna obscura | ||
Latest revision as of 20:30, 5 November 2020
Roots to 15 cm, tip mostly rounded; sheath not winged. Stipes white, small, often decaying. Fronds floating, 1 or 2–5 or more, coherent in groups, obovate, flat or gibbous, 1–3.5 mm, 1–1.5 times as long as wide, margins entire; veins 3, greatest distance between lateral veins near middle; very distinct papillae near apex, some smaller indistinct ones on midline of upper surface; lower surface very often red colored (more intensely than on upper), coloring beginning at attachment point of root, lower upper surface sometimes with red spots; air spaces shorter than 0.3 mm; distinct turions absent. Flowers: ovaries 1-ovulate, utricular scale with narrow opening at apex. Fruits 0.5–0.7 mm, not winged. Seeds with 10–16 distinct ribs, staying within fruit wall after ripening. 2n = 40, 42, 50.
Phenology: Flowering (occasional) spring–fall.
Habitat: Mesotrophic to –eutrophic, quiet waters, in temperate to subtropical regions with mild winters
Elevation: 0–800 m
Distribution
Ala., Ark., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Md., Minn., Miss., Mo., Nebr., N.J., N.Y., N.C., Ohio, Okla., Pa., S.C., S.Dak., Tenn., Tex., Va., Wis., c Mexico, South America (Colombia, Ecuador), Hawaii.
Discussion
Selected References
None.