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Alien invaders and native thugs: some new concerns Ian Denholm Botanical Society of the British Isles.

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Presentation on theme: "Alien invaders and native thugs: some new concerns Ian Denholm Botanical Society of the British Isles."— Presentation transcript:

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2 Alien invaders and native thugs: some new concerns Ian Denholm Botanical Society of the British Isles

3 Alien invaders I: Chilean Giant Rhubarb Gunnera tinctoria From stately homes.. to Irish & Scottish riverbanks

4 Alien invaders I: Chilean Giant Rhubarb Gunnera tinctoria

5 Alien invaders I: Chilean Giant Rhubarb Gunnera tinctoria The Mayo News, July 2010 Gunnera kill begins on Achill. “ARMED with hooks, machetes and a couple of gallons of ‘round- up’, volunteers have travelled to Achill Island to try to eradicate the Gunnera plant”.

6 Alien invaders II: Ragweed Ambrosia artemisiifolia World’s most allergenic plant?

7 Alien invaders III: Fringe-cups Tellima grandiflora

8 Alien invaders IV: Summer cypress Bassia scoparia

9 “Natives good, aliens bad?” www.bsbi.org.uk/alien_invaders_.html Cornflower, corncockle & Fuchsia: bad aliens? Nettle, bramble & bracken: native thugs?

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