Which of the following nettle species is dangerous to humans?

The tree nettle, or ongaonga in Māori, is endemic to New Zealand. The toxin present in its spines is tryfydin, which causes powerful stimulation of the parasympathetic nerve system. Multiple stingings can have a very painful reaction causing a rash and itching, and in high concentrations loss of motor movement, paralysis, drop in blood pressure, blurred vision and confusion. There has been one recorded human death from contact.