This article is also from Wikipedia.org and it focuses on orchids. 

Orchidaceae (or Orchid family) is the largest family of the flowering plants (Angiospermae).^[1][2] Its name is derived from the genus Orchis.  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)^[3] 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.^[4]

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