Nick Upton / Monkshood (Aconitum napellus) flowering among limestone rocks on montane pastureland, Covadonga, Picos de Europa, Asturias, Spain, August.

Nick Upton / Monkshood (Aconitum napellus) flowering on montane pastureland above Lake Ercina, Lakes of Covadonga, Picos de Europa, Asturias, Spain, August.

Loic Poidevin / Monkshood (Aconitum napellus) in flower in mountain, Valais, Switzerland, September

Will Watson / Monk's-hood (Aconitum napellus), Cadmore Brook, Tenbury Wells, Worcestershire, England, UK, May.

Alex Hyde / Monkshood (Aconitum napellus) Nordtirol, Austrian Alps. June.

Nick Upton / Alpine wolfsbane / Yellow monkshood (Aconitum lycoctonum neapolitanum) a highly toxic plant, growing on karst limestone mountainside at 1700m, Triglav National Park, Slovenia, July

Nick Upton / Alpine wolfsbane / Yellow monkshood (Aconitum lycoctonum neapolitanum) a highly toxic plant, growing on karst limestone mountainside at 1700m, Triglav National Park, Slovenia, July

Nick Upton / Highly toxic Alpine Wolfsbane / Yellow monkshood (Aconitum lycoctonum neapolitanum) clump growing on karst limestone mountainside at 1600m, Triglav National Park, Slovenia, July.

Robert Thompson / Wolfsbane {Aconitum vulparia} Lago di Limo, Dolomites, Italy

Philippe Clement / Wolfsbane (Aconitum vulparia) in flower, Italy

Lewis Jefferies / Monkshood (Aconitum napellus) in flower on mountainside with view to Seceda Mountain on the Adolf Munkel Hiking route, Odle/ Geisler mountain group, Puez-Odle Nature Park, South Tyrol, Italian Dolomit...

Lewis Jefferies / Monkshood (Aconitum napellus) in flower on mountainside with view to Seceda Mountain on the Adolf Munkel Hiking route, Odle/ Geisler mountain group, Puez-Odle Nature Park, South Tyrol, Italian Dolomit...

Lewis Jefferies / Monkshood (Aconitum napellus) in flower on mountainside with view to Seceda Mountain on the Adolf Munkel Hiking route, Odle/ Geisler mountain group, Puez-Odle Nature Park, South Tyrol, Italian Dolomit...

Konrad Wothe / Wolf's bane (Aconitum lycoctonum ranunculifolium) flowering, Alps, Engadin, Switzerland, Europe. July.

Paul Harcourt Davies / Wolf's-bane (Aconitum lycoctonum) in flower, Lazio, Italy. July.

Pal Hermansen / Monkshood (Aconitum lycoctonum) Photograph taken with the Kirlian technique, a technique which allows imaging of electrical coronal discharge.

Steve Nicholls / Monkshood (Aconitum napellus) growing on the banks of the Mells Stream in Edford Woods, Somerset, UK, a Somerset Wildlife Trust reserve. May 2011