I agree, 'Spark's Variety' appears to have very dark blue flowers while the color of the blooms on the plant in question seem much lighter. Maybe the image could be moved over to the general entry for Monkshood (Aconitum)
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Name: Lauri N Central Wash. - the dry side (Zone 5b)
You can move it if you want. I received it as Spark's Variety and figured mine was a bit lighter perhaps because of my alkaline soil. I don't really know, other than it's a different cultivar than my other monkshood for sure.
Name: Evan Pioneer Valley south, MA, USA (Zone 6a)
Thanks Lauri. The question of soil acidity/alkalinity raises an interesting question since we know it can affect flower color in some plants. I don't have any idea what affect it would have on monkshood. There are certain blue and purple flowers that I've taken a dozen photographs of but they always end up looking lighter than in real life.