Courtesy of Wirecutter, I came across this video clip.
I've seen plant-based poisons in action. The San people, commonly known as Bushmen, of the Kalahari Desert and points surrounding, use them to hunt game - and, on occasion, people too. In the colonial era, the Bushmen had it very hard, with both whites and blacks regarding them as vermin, and shooting them for casual sport. The white population 'grew up' and learned better, but for many black people in Africa, a Bushman is still sub-human, of no value as a human being. The Bushmen in northern Namibia ran into that with SWAPO terrorists, who would kill them out of hand. As a result, many joined the South African armed forces, serving as trackers, where their skills became legendary. It's reported that more than a few SWAPO cadres were found lying in the bush, a small Bushman arrow protruding from some body part that really shouldn't have killed them - but for the poison on the tip . . .