Botanically speaking, most of the “nuts” we eat are actually fruit seeds (most culinary nuts are not botanical nuts).
Flowering plants (angiosperms) are land based plants that flower and produce seeds. All fruits are derived from flowering plants, while the green part of a plant can be referred to as “vegetable”. Not all flowering plants produce a fruit.
Cannabis (pot) is a single plant genus, but selective breeding and hybridization of the Indica and Sativa species has produced many unique strains. Strains have different amount of specific organic compounds each affecting human physiology differently.
All fruits come from flowers, but not all flowers become fruits. Fruits are typically derived from the ovaries of a flower and contain seeds.
There are no recorded deaths due marijuana overdose, however overdose is theoretically possible at about 40,000 times the amount needed to get high.