Overview

Distribution

Myriophyllum sibiricum Kom.:
Canada (North America)
Russian Federation (Asia)
United States (North America)
China (Asia)
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Myriophyllum magdalenense Fernald:
Canada (North America)
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Myriophyllum exalbescens Fernald:
Canada (North America)
United States (North America)
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Myriophyllum spicatum var. exalbescens (Fernald) Jeps.:
United States (North America)
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Myriophyllum spicatum subsp. exalbescens (Fernald) Hultén:
Greenland (North America)
United States (North America)
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National Distribution

Canada

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Global Range: AK, AZ, CA, CO, CT, IA, ID, IL, IN, KA, MA, MD, ME, MI, MN, MO, MT, ND, NE, NH, NJ, NM, NV, NY, OH, OR, PA, SD, UT, VA, VT, WA, WI, WV, WY.

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Physical Description

Morphology

Description

Plants monoecious. Stem loosely erect in water, often whitish, few branched above, base characteristically curved or U-shaped on young plants; internodes distinct, ca. 1 cm. Submerged leaves 4- or 5-whorled, pectinate, ovate to oblong in outline; segments in 5-12 pairs, filiform, 1-5 cm. Inflorescence a terminal spike of 2-4-whorled flowers, mostly 4-10 cm; bracts shorter than or rarely equaling fruits. Male flowers: bracteoles oblong-spatulate or ovate-oblong, margin entire; petals pinkish; stamens 8. Female flowers: bracteoles mostly serrate or somewhat pectinate-toothed at margin; perianth absent or sepals vestigial. Fruit 4-loculed, globose, ca. 2 mm; mericarps abaxially tuberculate or aculeate. Fl. and fr. Apr-Sep.
  • Flora of China @ eFloras.org
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Diagnostic Description

Synonym

Myriophyllum exalbescens Fernald; M. spicatum Linnaeus subsp. exalbescens (Fernald) Hultén; M. spicatum var. exal bescens (Fernald) Jepson; M. spicatum var. muricatum Maximowicz.
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Rare terrestrially, rarely branching near the surface, stem not thickened below the inflorescence, bracts shorter than the flowers or fruit, carpels in fruit smooth or finely tubercled.

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Ecology

Habitat

Comments: Circumneutral to alkaline, often brackish or calcareous waters of lakes, ponds, quiet pools and streams.

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Habitat & Distribution

Heilongjiang, Jiangsu, Jilin, Nei Mongol, Qinghai, Sichuan, Xinjiang, Xizang, Yunnan [Russia; North America].
  • Flora of China @ eFloras.org
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General Ecology

Shade intolerance of this species allows M. spicatum to outcompete it.

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Life History and Behavior

Reproduction

Turion formation occurs from October through June, Seeds probably require winter cold treatment for germination. n=21.

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Myriophyllum sibiricum

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 4
Species: 15
Species With Barcodes: 1

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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: NNR - Unranked

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Wikipedia

Myriophyllum sibiricum

Myriophyllum sibiricum is a species of water milfoil known by the common name shortspike water milfoil. It is native to Russia, China, and much of North America, where it grows in aquatic habitat such as ponds and streams. It generally grows over a meter long, its green stem drying white. It is lined with whorls of fanlike green leaves divided into many narrow, feathery lobes. The erect inflorescence is a spike of small flowers up to 8 centimeters long which grows above the water's surface.

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