by 
The Curious Bag
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Peace lilies, also known as spathiphyllum or spaths, are actually not lilies at all. They are members of the Araceae or Arum family, which includes plants like diffenbachia, philodendrons and anthuriums. Their easy care requirements, glossy green leaves and graceful white bracts make them very popular as houseplants and for use in indoor landscaping for offices, malls and other public buildings.
Origins
Spathiphyllum is a sub-tropical plant that is indigenous to Central American rain forests. It is found as far south as northern Brazil and as far north as Mexico.
Hybrids
Most peace lilies that are sold as house plants are hybrids cultivated from subspecies growing in Central America.
Mauna Loa Peace LIly
The Mauna Loa peace lily, one of the most popular hybrids, was cultivated from the Central American spathiphyllum Wallisii.
Asian Peace Lilies
Four species of spathiphyllum have been found growing in Southeast Asia and the nearby islands.
Expert Insight
While peace lilies will tolerate low light and dry conditions, their natural environment is the rain forest floor where they get plenty of moisture and bright, indirect sunlight.
Fun Fact
NASA lists the Mauna Loa peace lily among its 15 plants that are best for removing environmental toxins from the indoor air.
Source:
Aggie-horticulture-tamu.edu: Araceae or Arum Family
Softpedia.com: Top 15 NASA's Plants That Can Save Your Life
Backyardgardener.com: Spathiphyllum wallisii (Mauna Loa)
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