The ways that different cultures use plants in their daily lives are dealt with under that aspect of economic botany called ethnobotany. We use plants as food (e.g. grains, roots and tubers, vegetables and leafy greens, herbs, fruits, nuts, and pulses); food and drink additives (spices, sweeteners, flavourings, and colourings etc.); psychoactive plants (tobacco, tea, coffee, opium, cannabis, alcoholic drinks, mescalin, heroin etc.); poisons (strychnine); for medicines and drugs; fibres (cotton, hemp, flax, sisal etc.); dyes (indigo); perfumes and aromas (rose, jasmine, pot-pourri, incense); oils (lavender, ulan, olive), fats (avocado), waxes (beeswax); resins (for varnishes, adhesives, glazes); rubber; wood (as timber, fuel, source of paper); as a source of structural materials and also for decoration.
One way of describing economic plants is to proceed alphabetically, chronologically, or preferentially through a list of ‘useful’ plants and it seems that this can be covered adequately by confining ourselves to about fifty plants though we might differ in our views on about 20-30% of those that should be included.
What were the individual starring plants that played a major role in the history of humanity – in pre-history, the classical world, and through to the modern era as the number of recorded flowering plant species has escalated from about 500 or so in the Classical world, to 10,000 in the 1750s (Linnaeus estimated the number of species in the world to not exceed this number), and about 250,000 today.
The article Major world plants provides a summary account or an aide de memoire of the major plants of significance to humanity, past and present – ranging from major crops, medicines, and structural materials to those that have collectively generated our global economy, the ravages wars, and the injustices of slave plantations. Most of these plants are of economic significance.
Industrial development for pharmaceuticals, packing materials, laundry chemicals (collar starch), and various other starches (dextrin, refined corn oil, molasses, lactic acid, sorbitol, mannitol, methyl glucoside), a flour, corn syrup as a sugar substitute which after further processing can converted glucose to the sweeter fructose to produce high fructose corn syrup which is increasingly replacing cane sugar in many commodities and a major component of soft drinks. Present-day genetic engineering attempts to produce transgenic plants with increased yield, resistance to pests and diseases, herbicide resistance (Bt corn).