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.
Amorphophallus titanum (Titan arum) - The largest flower in the world was blooming in Blanco , Veracruz , Mexico . Two meters feet) high and weighing 75 kilos lbs). It has the peculiarity of blooming only during three days every 40 years.