- Plants are living organisms belonging to the kingdom Plantae.
- Plants include familiar organisms such as trees, herbs, bushes, grasses, vines, ferns, mosses, and green algae.
- About 350,000 species of plants, defined as seed plants,
bryophytes, ferns and fern allies, are estimated to exist currently.
- As of 2004, some 287,655 species had been identified, of which 258,650 are flowering and 18,000 bryophytes.
- Most of plants get their energy from sunlight via a process called photosynthesis.
- Aristotle divided all living things between plants (which generally do not move), and animals (which often are mobile to catch their food).
-A wide variety of plants are poisonous.
- The Venus flytrap is carnivorous plant which eats insects.
- Orchid family is the largest family of the flowering plants.
Plant classification is the placing of known plants into groups or categories to show some relationship.
Scientific classification follows a system of rules that standardizes the results, and groups successive
categories into a hierarchy. For example, the family to which the lilies belong is classified as follows:
Genera : ... ...
The classification of plants results in an organized system for the naming and cataloging of
future specimens, and ideally reflects scientific ideas about plant inter-relationships.
The Royal Botanical Gardens of Kew list 880 genera and nearly 22,000 accepted species, but the exact number is
unknown (perhaps as many as 25,000) because of taxonomic disputes. The number of orchid species equals about
four times the number of mammal species, or more than twice the number of bird species. It also encompasses about
6–11% of all seed plants. About 800 new orchid species are added each year. The largest genera are
Bulbophyllum (2,000 species), Epidendrum (1,500 species), Dendrobium (1,400 species) and
Pleurothallis (1,000 species). The family also includes the Vanilla (the genus of the vanilla plant),
Orchis (type genus) and many commonly cultivated plants like some Phalaenopsis or Cattleya.
Weeds are plants that grow where people do not want them. People have spread plants beyond their native ranges
and some of these introduced plants become invasive, damaging existing ecosystems by displacing native species.
Invasive plants cause billions of dollars in crop losses annually by displacing crop plants, they increase the cost
of production and the use of chemical means to control them affects the environment.
Plants may Harm too.
Plants may cause harm to people. Plants that produce windblown pollen invoke allergic reactions in people who
suffer from hay fever. A wide variety of plants are poisonous. Several plants cause skin irritations when touched,
such as poison ivy. Certain plants contain psychotropic chemicals, which are extracted and ingested or smoked,
including tobacco, cannabis (marijuana), cocaine and opium, causing damage to health or even death. Both
illegal and legal drugs derived from plants have negative effects on the economy, affecting worker productivity and
law enforcement costs. Some plants cause allergic reactions in people and animals when ingested, while other
plants cause food intolerances that negatively affect health.
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