Eurasian Watermilfoil

Myriophyllum spicatum

''Myriophyllum spicatum'' is native to Europe, Asia, and north Africa, but has a wide geographic and climatic distribution among some 57 countries, extending from northern Canada to South Africa. It is a submerged aquatic plant, grows in still or slow-moving water, and is considered to be a highly invasive species.
Myriophyllum spicatum Seen in Het Zwin, nature reserve in Belgium (August 2020).  Belgium,Geotagged,Myriophyllum spicatum,Summer

Appearance

Eurasian watermilfoil has slender stems up to 250 centimetres long. The submerged leaves are borne in pinnate whorls of four, with numerous thread-like leaflets roughly 4–13 mm long. Plants are monoecious with flowers produced in the leaf axils on a spike 5–15 cm long held vertically above the water surface, each flower is inconspicuous, orange-red, 4–6 mm long. Eurasian water milfoil has 12- 21 pairs of leaflets while northern watermilfoil ''M. sibiricum'' only has 5–9 pairs. The two can hybridize and the resulting hybrid plants can cause taxonomic confusion as leaf characters are intermediate and can overlap with parent species.

Distribution

''Myriophyllum spicatum'' is found in disperse regions of North America, Europe, Asia, Australia, and Africa.

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Status: Least concern
EX EW CR EN VU NT LC
Taxonomy
KingdomPlantae
DivisionAngiosperms
ClassEudicots
OrderSaxifragales
FamilyHaloragaceae
GenusMyriophyllum
SpeciesM. spicatum
Photographed in
Belgium