Alien invaders and native thugs: some new concerns

Ian Denholm

Botanical Society of the British Isles

Alien invaders I: Chilean Giant Rhubarb Gunnera

tinctoria

From stately homes..

to Irish & Scottish riverbanks

Alien invaders I: Chilean Giant Rhubarb Gunnera

tinctoria

Alien invaders I: Chilean Giant Rhubarb Gunnera

tinctoriaThe 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” .

Alien invaders II:Ragweed Ambrosia artemisiifolia

World’s most allergenic plant?

Alien invaders III:Fringe-cups Tellima grandiflora

Alien invaders IV: Summer cypress Bassia scoparia

“Natives good, aliens bad?”

www.bsbi.org.uk/alien_invaders_.html

Cornflower, corncockle & Fuchsia: bad aliens?

Nettle, bramble & bracken: native thugs?