WHORLED WATER-MILFOIL

Myriophyllum verticillatum

Water-Milfoil Family [Haloragaceae]

month8jul month8july month8aug

status
statusZnative
flower
flower8green
morph
morph8actino
petals
petalsZ4
type
typeZspiked
stem
stem8round
rarity
rarityZuncommon
sex
sexZbisexual
sex
sexZmale
sex
sexZfemale

27th June 2009, MB&BC canal, Whitefield, Lancs. Photo: © RWD
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27th June 2009, MB&BC canal, Whitefield, Lancs. Photo: © RWD
Leaves mostly in whorls of five.


27th June 2009, MB&BC canal, Whitefield, Lancs. Photo: © RWD
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27th June 2009, MB&BC canal, Whitefield, Lancs. Photo: © RWD
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27th June 2009, MB&BC canal, Whitefield, Lancs. Photo: © RWD
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27th June 2009, MB&BC canal, Whitefield, Lancs. Photo: © RWD
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27th June 2009, MB&BC canal, Whitefield, Lancs. Photo: © RWD
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27th June 2009, MB&BC canal, Whitefield, Lancs. Photo: © RWD
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30th June 2009, MB&BC canal, Whitefield, Lancs. Photo: © RWD
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Many similarities to : other Milfoils such as Spiked Water-Milfoil (Myriophyllum spicatum),, Alternate Water-Milfoil (Myriophyllum alterniflorum), Parrot's Feather (Myriophyllum aquaticum), Two-leaf Water-milfoil (Myriophyllum heterophyllum) nor with Red Water-milfoil (Myriophyllum verrucosum).

The leaves of the related Spiked Water-Milfoil are between 0.5 to 1.5 times as long as are the gaps between the whorls on the stem and each has between 13 to 35 segments (whereas those of Whorled Water-milfoil are between 1.5 to 4 times longer than the (shorter) internodes between whorls, 25 to 35 segments). The flower spike of Spike Water-milfoils do not collapse when removed from the water (whereas those of Whorled Water-milfoil do). Also, the leaves of Spiked Water-Milfoil are all below the waters surface, whereas the leaves of Whorled Water-milfoil are intermingled between the flowers and above water-level (although there are also submerged leaves without intermingled flowers).


  Myriophyllum verticillatum  ⇐ Global Aspect ⇒ Haloragaceae  

Distribution
 family8Water-Milfoil family8Haloragaceae
 BSBI maps
genus8Myriophyllum
Myriophyllum
(Water-Milfoils)

WHORLED WATER-MILFOIL

Myriophyllum verticillatum

Water-Milfoil Family [Haloragaceae]