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Taxonomically, the term "weed" has no botanical significance, because a plant that is a weed in one context, is not a weed when growing in a situation where it is wanted. Some plants that are widely regarded as weeds are intentionally grown in gardens and other cultivated settings. For this reason, some plants are sometimes called beneficial weeds.
Weed identification may relate to History of plant systematics, the classification of plants; Botany, the study of plants; Taxonomy, the classification of living things; Weed plant science; Weed (disambiguation)
Cannabis also has a long history of being used for medicinal purposes, and as a recreational drug known by several slang terms, such as marijuana, pot or weed. Various cannabis strains have been bred, often selectively to produce high or low levels of tetrahydrocannabinol (THC), a cannabinoid and the plant's principal psychoactive constituent.
Impatiens capensis, the orange jewelweed, common jewelweed, spotted jewelweed, jewelweed, [3] spotted touch-me-not, or orange balsam, [4] is an annual plant in the family Balsaminaceae that is native to North America. [5]
Pontederia cordata, common name pickerelweed or pickerel weed , is a monocotyledonous aquatic plant native to the Americas. It grows in a variety of wetlands , including pond and lake margins across an extremely large range from eastern Canada south to Argentina.
Matricaria discoidea, commonly known as pineappleweed, [3] wild chamomile, disc mayweed, and rayless mayweed, is an annual plant native to North America and introduced to Eurasia where it grows as a common herb of fields, gardens, and roadsides. [4]
Tridax procumbens, commonly known as coatbuttons [2] or tridax daisy, is a species of flowering plant in the family Asteraceae. It is best known as a widespread weed and pest plant. It is native to the tropical Americas including Mexico, [1] but it has been introduced to tropical, subtropical, and mild temperate regions worldwide.
Rudyard Kipling wrote, "The fire-weed glows in the centre of the drive ways". [29] In The Fellowship of the Ring (1954), J. R. R. Tolkien lists fireweed as one of the flowering plants returning to the site of a bonfire inside the Old Forest. [30] As the first plant to colonise waste ground, fireweed is often mentioned in postwar British literature.