Haloragaceae
Myriophyllum

Myriophyllum verticillatum L.

First published in Sp. Pl.: 992 (1753)
This species is accepted
The native range of this species is Temp. Northern Hemisphere. It is a helophyte and grows primarily in the temperate biome.

Descriptions

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/164335/1042718

Conservation
LC - least concern
[IUCN]

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: not threatened. Confidence: confident
[AERP]

Ghazanfar, S. A. & Edmondson, J. R (Eds). (2014) Flora of Iraq, Volume 5 Part 2: Lythraceae to Campanulaceae.

Note
Vegetatively similar to M. spicatum and scarcely separable from it when sterile
Morphology Reproductive morphology Inflorescences Bracts
All bracts pinnate or pectinate, longer than flowers; upper bracts pectinate and commonly 2–7× longer than flowers, lower passing gradually to a foliaceous form, larger
Morphology Reproductive morphology Flowers
Male flowers with 4 calyx teeth broadly triangular, ± 0.5 mm; petals 4, caducous, 1.5–2.5 × 0.4–0.6 mm, deeply concave, greenish yellow, very rarely reddish; stamens 8, ± 3 mm, the filaments half as long as the anthers Male, female and hermaphrodite flowers disposed as in M. spicatum, but hermaphrodite usually more numerous than in that species; bracteoles 2, minute, ovate, acute, coarsely dentate Female flowers with 4 broadly triangular, ± 0.5 mm, persistent calyx teeth and minute, early-caducous petals; ovary 4-angled, 4-sulcate, ± 1 mm; styles very short, stigmas strongly recurved, densely papillose
Morphology Reproductive morphology Fruits
Fruit subglobular, 4-furrowed, ± 3 mm in diameter, separating in 4 oblong-ovoid nutlets; nutlets margined or narrowly winged at angles of rupture, smooth or faintly rugose on the dorsal surface, ventral surfaces flat.
Ecology
Lakes, streams, wet and moist soils; alt.: up to 920 m
Phenology
Flowering and fruiting: April –Aug.
Distribution
Throughout Europe; Turkey, Jordan, Iran, Caucasus, C Asia, E & W Siberia, Kamchatka, Mongolia, China, Japan, N. India, NW Africa (Algeria, Morocco), N America.
[FIQ]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • Flora of Iraq

    • Ghazanfar, S. A., Edmondson, J. R. (Eds). (2013-2019). Flora of Iraq, Volumes 5.1, 5.2 and 6.0. Kew Publishing
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Herbarium Catalogue Specimens

    • 'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

  • IUCN Categories

    • IUCN Red List of Threatened Species
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Science Photographs

    • Copyright applied to individual images