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Mixed Prepositions 17
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Orchids are the largest and most diverse the flowering plant families, with
over 800 described genera and 25,000 species. Some sources give 30,000
species, but the exact number is unknown since classification differs greatly
the academic world. Revisions of different genera occur a
monthly basis and this will increase the growing use genetic
research and biochemistry. More than 100,000 hybrids and cultivars, produced
horticulturists, have been created the introduction of tropical
species the 19th century. The Kew "World Checklist of Orchids" includes
about 24,000 accepted species. About 800 new species are added each year
Orchids, along grasses, are considered examples the most
advanced (derived) floral evolution through their interactions pollinators
and their symbiosis orchid mycorrhizal fungi.
Source: http://en.wikipedia.org/wiki/Orchids
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