Introduction to fenland aquatic plants

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Presentation transcript:

Introduction to fenland aquatic plants Jonathan Graham

Emergent & aquatic plants

Groups of water plants Floating plants (typically floating leaves only) Submerged plants with simple leaves Submerged plants with divided leaves Pondweeds Arrowhead and similar plants Aquatic bryophytes and algae

Groups of water plants

Floating plants (typically floating leaves only)

Duckweeds

Large Duckweed and Least Duckweed

Fat Duckweed Ivy-leaved duckweed

Yellow Water-lily White Water-lily

Fringed Water-lily Frog-bit

Water Fern (Azolla)

Floating Crystalwort Fringed Heartwort

Submerged plants with simple leaves

Elodea species Canadian pondweed (first UK record 1836) Nuttall’s waterweed (first UK record 1966)

Water-starworts (Callitriche species) Floating rosettes Single stems

Mares-tail

Submerged plants with divided leaves

Water-crowfoots (aquatic Ranunculus species) White Flowers Single stems

Whorled Water-milfoil Water-milfoils Spiked Water-milfoil Whorled Water-milfoil

Typical submerged form Water-violet Typical submerged form Terrestrial Form

Hornworts

Bladderworts

Pondweeds Potamogeton species (broadleaved & grass-leaved pondweeds) Opposite-leaved pondweed Horned Pondweed

Broad-leaved Pondweeds Shining Pondweed

Grass-leaved Pondweeds Hair-like Pondweed Grass-wrack Pondweed

Lesser Pondweed

Hair-like Pondweed

Opposite-leaved Pondweed Single stem Typical habitat

Horned Pondweed

Arrowhead and similar species

Unbranched bur-reed Arrowhead

Unbranched bur-reed and Arrowhead

Lesser Water-plantain Water-plantains Lesser Water-plantain

Submerged bryophytes and algae

Filamentous algae

Charophytes (Stoneworts) Chara vulgaris Tolypella glomerata

Greater Water-moss

Other useful features

Turions

Terrestrial forms

Petal nectar-pits (Water-crowfoots)

Important factors affecting drains of conservation value for plants Aquatic plants are useful indicators of the conservation value of drains Important factors affecting drains of conservation value for plants Bed geology Clear water Not heavily shaded (reed or bushes) Maintained summer water level (crop irrigation) Some regular management (dredging and weed cutting)