''Paschalococos disperta'', the Rapa Nui palm or Easter Island palm, formerly '' Jubaea disperta,'' was the native cocoid

palm Palm most commonly refers to: * Palm of the hand, the central region of the front of the hand * Palm plants, of family Arecaceae ** List of Arecaceae genera * Several other plants known as "palm" Palm or Palms may also refer to: Music * Palm (b ...

species of

Easter Island Easter Island ( rap, Rapa Nui; es, Isla de Pascua) is an island and special territory of Chile in the southeastern Pacific Ocean, at the southeasternmost point of the Polynesian Triangle in Oceania. The island is most famous for its nearly ...

. It disappeared from the pollen record circa AD 1650.

Taxonomy

It is not known whether the species is distinct from ''Jubaea,'' but there is no evidence that it was ''Jubaea'' either, as the soft tissues used for identification of cocoid genera have not been preserved. All that remain are

pollen Pollen is a powdery substance produced by seed plants. It consists of pollen grains (highly reduced microgametophytes), which produce male gametes (sperm cells). Pollen grains have a hard coat made of sporopollenin that protects the gametoph ...

from lake beds, hollow

endocarp Fruit anatomy is the plant anatomy of the internal structure of fruit. Fruits are the mature ovary or ovaries of one or more flowers. They are found in three main anatomical categories: aggregate fruits, multiple fruits, and simple fruits. Aggr ...

s (nuts) found in a cave, and casts of root bosses. Partly to avoid giving credence to the common but speculative assumption that the palms were ''Jubaea chilensis'' and used as rollers to move the

moai Moai or moʻai ( ; es, moái; rap, moʻai, , statue) are monolithic human figures carved by the Rapa Nui people on Rapa Nui in eastern Polynesia between the years 1250 and 1500. Nearly half are still at Rano Raraku, the main moai quarry, but ...

statues of Easter Island,

John Dransfield John Dransfield (born 1945) is an honorary research fellow and former head of palm research at the Royal Botanic Gardens, Kew, United Kingdom, as well as being an authority on the phylogenetic classification of palms. Dransfield has written ...

assigned the species to a new genus. The assignment is not accepted by the

World Checklist of Selected Plant Families The World Checklist of Selected Plant Families (usually abbreviated to WCSP) is an "international collaborative programme that provides the latest peer reviewed and published opinions on the accepted scientific names and synonyms of selected pla ...

, which does not list the genus ''Paschalococos'', nor by

The Plant List The Plant List was a list of botanical names of species of plants created by the Royal Botanic Gardens, Kew and the Missouri Botanical Garden and launched in 2010. It was intended to be a comprehensive record of all known names of plant specie ...

which regards the name as "unresolved".

Usage and extinction

Human overpopulation Humans (''Homo sapiens'') are the most abundant and widespread species of primate, characterized by bipedalism and exceptional cognitive skills due to a large and complex brain. This has enabled the development of advanced tools, culture, an ...

in the period AD 800 to 1600 led to

extinction Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed an ...

of the Rapa Nui palm. Hogan believes that loss of the Rapa Nui palm along with other biota contributed to the

collapse of society Societal collapse (also known as civilizational collapse) is the fall of a complex human society characterized by the loss of cultural identity and of socioeconomic complexity, the downfall of government, and the rise of violence. Possible causes ...

on Easter Island.C. Michael Hogan. 2008 Dransfield suggests that the trees became extinct as they were cut down for the edible palm hearts as food supplies ran out for an island Human overpopulation. It is also likely that many palms were cut down to build canoes for fishing. Another possibility is the

Polynesian rat The Polynesian rat, Pacific rat or little rat (''Rattus exulans''), known to the Māori as ''kiore'', is the third most widespread species of rat in the world behind the brown rat and black rat. The Polynesian rat originated in Southeast Asia, an ...

, brought in by settlers arriving between AD 800 and 1000, consumed the nuts of the palm, leaving insufficient numbers to reseed the island.
LA Times, Easter Island has stone heads, but little else. What happened?, 20 June 2012. Despite the extinction of the tree, this palm appears to have been represented two hundred years later in the

Rongorongo Rongorongo (Rapa Nui: ) is a system of glyphs discovered in the 19th century on Rapa Nui (Easter Island) that appears to be writing or proto-writing. Numerous attempts at decipherment have been made, with none being successful. Although some c ...

script of Easter Island with the glyph Rongorongo 067

References

Cocoseae Flora of Easter Island Extinct plants Species made extinct by human activities Holocene extinctions Monotypic Arecaceae genera Plant extinctions since 1500 Controversial taxa {{Cocoseae-stub

Taxonomy

Usage and extinction

Further reading

References