One of the most deadly plant toxins, abrin, is produced by rosary pea (Abrus precatorius). As little as of toxin per body weight will cause fatality in humans (a single seed). Birds appear to be unaffected by the deadly toxin.
This is a Hydnora Africana plant. The plant grows underground, except for a fleshy flower that emerges above ground and emits an odor of feces to attract its natural pollinators, dung beetles, and carrion beetles.