Ongaonga - Urtica ferox
Of course there is a debate about whether this New Zealand-plant is the most dangerous or the Australian Dendrocnide moroides, anyway this plant was listed as such in the guiness book of records and I think so too...
Apart from allergies it can be said that the toxin of the Ongaonga (Urtica ferox), a nettle endemic to Aotearoa (New Zealand), can cause the most irreversible (polyneuropathy) and most painful injuries. The pain lasts for 3 days! A human death was also recorded.
I'm waiting for germination of the seeds, which is complicated, then I will make a cage for it, so that nobody gets hurt.
Today I put the seeds under the microscope and I think they can be called the most dangerous seeds *g*, as they also have small stinging hairs filled with toxin: