Jepson eFlora: Taxon page
Vascular Plants of California
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M |
| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon

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].
Reference: Ceska et al. 1986 Brittonia 38:73--81
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.
Jepson eFlora Author: Adolf Ceska & Oldriska Ceska
Reference: Ceska et al. 1986 Brittonia 38:73--81
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

Previous taxon: Myriophyllum quitense
Next taxon: Myriophyllum spicatum

Name Search

Botanical illustration including Myriophyllum sibiricum

botanical illustration including Myriophyllum sibiricum


Citation for this treatment: Adolf Ceska & Oldriska Ceska 2012, Myriophyllum sibiricum, in Jepson Flora Project (eds.) Jepson eFlora, /eflora/eflora_display.php?tid=34273, accessed on August 01, 2021.

Citation for the whole project: Jepson Flora Project (eds.) 2021, Jepson eFlora,, accessed on August 01, 2021.

Myriophyllum sibiricum
click for enlargement
© 2020 Neal Kramer
Myriophyllum sibiricum
click for enlargement
© 2015 Steve Matson
Myriophyllum sibiricum
click for enlargement
© 2008 Neal Kramer
Myriophyllum sibiricum
click for enlargement
© 2008 Steve Matson
Myriophyllum sibiricum
click for enlargement
© 2008 Steve Matson
Myriophyllum sibiricum
click for enlargement
© 2015 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
1. You can change the display of the base map and layers by clicking on the layer control box in the upper right-hand corner.
2. California county polygons can be turned off and on in the layer control box.
3. Filling of Jepson subdivision polygons can be turned off and on in the layer control box.
4. Marker clustering can be turned on by clicking this link:      Marker Clustering ON
WARNING: This page may load slowly if there are large numbers of specimens in the database.
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).


View elevation by latitude chart

Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).