Appendix 2 Foreign Invasive Plant Species - Planet WGSW-24010 User Manual

Appendix 2 For eign invasive plant species
Several foreign species of macrophytes have become established in the British Isles. Some of
which are considered to be nuisance vegetation as they have spread rapidly and compete with
other native species. While surveying for river macrophytes it takes little time to note the
presence of these species. The species to look out for are:
River species:
The following species are assigned a Species Trophic Rank. Their presence can affect the
distribution/abundance of natives.
Canadian Pondweed
Nuttall's pondweed
Water-fern
Sweet-flag
Others to note:
Australian Swamp Stone-crop
Cape Pondweed
Beggar-ticks
Large-flowered Water-thyme
Curly Water-thyme
Lupin
Pink Purslane
Winter Heliotrope
Canary Grass
Swamp Meadow-grass
Tape-grass
Purple Iris
Indian Balsam
Orange Balsam
Giant Hogweed
Japanese Knotweed
Monkey flower
Information from SERCON lists and pers comm. Nigel Holmes.
R&D Technical Report E38
Elodea canadensis
Elodea nuttallii
Azolla filiculoides
Acorus calamus
Crassula helmsii
Aponogeton distachyos
Bidens frondosa
Egeria densa
Lagarosiphon major
Lupinus nootkatensis
Montia sibirica
Petasites fragrans
Petasites japonicus
Phalaris canariensis
Poa palustris
Vallisneria spiralis
Iris versicolor
Impatiens glandulifera
Impatiens capensis
Heracleum mantegazzianum
Polygonum (Reynoutria) japonica
Mimulus guttatus
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