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Myriophyllum sibiricum

Higher Taxonomy
Family: HaloragaceaeView Description 

Habit: [Annual, shrub] perennial herb, generally aquatic or semiterrestrial, dioecious or monoecious. Leaf: cauline, opposite, alternate or whorled; submersed blades pinnately divided, segments thread-like; emergent leaves simple, entire to divided. Inflorescence: raceme, spike, or panicle; flowers 1 or clustered, short-pedicelled to +- sessile. Flower: generally unisexual, small; calyx tube short, fused to ovary, lobes 2--4; petals generally 2--4; stamens 4 or 8, filaments generally short; ovary inferior, chambers 1--4, styles 2--4, separate, stigmas generally plumose. Fruit: fleshy or of nut-like mericarps, dehiscent or not. Seed: generally 1 per chamber.
Genera In Family: 6--8 genera, +- 100 species: especially southern hemisphere, some cultivated. Note: Haloragis erecta (Murray) Eichler not naturalized in California.
eFlora Treatment Author: Adolf Ceska & Oldriska Ceska
Scientific Editor: Bruce G. Baldwin.
Genus: MyriophyllumView DescriptionDichotomous Key

Habit: Plant from rhizomes, occasionally with overwintering buds (late in growing season); occasionally terrestrial. Stem: simple or branched, generally green. Leaf: submersed leaves generally whorled, 3--6 per node; emergent leaves entire to pinnately divided, occasionally bract-like. Inflorescence: generally emergent, spike-like, simple or branched, terminal, flowers in whorls. Flower: proximal pistillate, middle occasionally bisexual, distal staminate; calyx lobes 4; petals generally 4, ephemeral on staminate flowers, minute or 0 on pistillate flowers; stamens generally 8; ovary 4-chambered. Fruit: mericarps 4, nut-like.
Species In Genus: +- 60 species: worldwide. Etymology: (Greek: many leaves, from leaf segments) Note: Myriophyllum specimens best collected in flower or fruit.
Unabridged Note: Plants should be washed first and then "floated" on the herbarium mounting paper in a shallow dish with water [see Ceska & Ceska 1987 Ann Missouri Bot Gard 73:825--827].

Myriophyllum sibiricum Kom.
Habit: Monoecious; winter buds cylindrical, at ends of non-flowering branches, generally in fall. Stem: > 1 m, +- white or pink when dry. Leaf: submersed leaves 1--3 cm, segments linear, < 20 mm, <= 28 per leaf, angles, spacing varying throughout leaf. Inflorescence: spike, 3--8 cm, emergent; bracts 1--3 mm, < flowers, oblanceolate to ovate, entire to coarsely toothed.
Ecology: Ponds, streams, lakes; Elevation: < 2600 m. Bioregional Distribution: NCo, NCoRI, CaRH, n SNH, SnFrB, SCoRO, SCo, SnGb, SnBr, PR, MP, w DMoj; Distribution Outside California: to Alaska, Canada, eastern United States, Eurasia. Flowering Time: Jun--Sep
Synonyms: Myriophyllum exalbescens Fernald; Myriophyllum spicatum L. subsp. exalbescens (Fernald) Hultén; Myriophyllum spicatum var. exalbescens (Fernald) Jeps.
Unabridged Note: Recognizable by sparse leaf segments in blunt angles to leaf rachis and by cylindrical winter buds.
eFlora Treatment Author: Adolf Ceska & Oldriska Ceska
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botanical illustration including Myriophyllum sibiricum


Citation for this treatment: Adolf Ceska & Oldriska Ceska 2016. Myriophyllum sibiricum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 29, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on April 29, 2016.

Myriophyllum sibiricum
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© 2008 Neal Kramer
Myriophyllum sibiricum
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© 2008 Steve Matson
Myriophyllum sibiricum
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© 2015 Steve Matson
Myriophyllum sibiricum
click for enlargement
© 2008 Steve Matson
Myriophyllum sibiricum
click for enlargement
© 2008 Steve Matson
Myriophyllum sibiricum
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© 2008 Steve Matson

More photos of Myriophyllum sibiricum in CalPhotos

Geographic subdivisions for Myriophyllum sibiricum:
NCo, NCoRI, CaRH, n SNH, SnFrB, SCoRO, SCo, SnGb, SnBr, PR, MP, w DMoj;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.