Description
Eurasian watermilfoil has slender stems up to 3 m long. The submerged leaves (usually between 15-35 mm long) are borne in whorls of four, pinnate, with the numerous leaflets thread-like, 4–13 mm long. Plants are monoecious with flowers produced in the leaf axils (male above, female below) on a spike 5–15 cm long held vertically above the water surface, each flower 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.
Read more about this topic: Myriophyllum Spicatum
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