altagardener wrote: The first photo shows one of the stands of Aconitum napellus that's been there for over 15 years - it starts blooming around mid-August and through fall; excellent fall colour. White-flowered plants have been produced by self-seeding in one of the other clumps. Aconitum vulparia has white-cream flowers on a modestly-sized plant, and blooms very early, while the remainder of the species/cultivars I have bloom much later. Aconitum lamarckii is similar (white-cream) but late blooming.
The most intriguing are a couple of mystery ones... one purchased as Aconitum sp. ex. DaVue Shan (the seed collection area in China); this one is 25-30 cm tall (the second and third photos).
The most curious is one that was supposed to be suitable for the alpine garden (grown from wild-collected seed again) but is a actually a huge plant with magnificent leaves in a large basal rosette and 10 foot long flowering stems (fourth and fifth photos). The closest I've come to figuring it out is Aconitum anthroideum, although that doesn't seem to entirely fit, from the description of it.
Anyway, it's a great genus - keep trying all the ones you come across!