The

palm tree The Arecaceae () is a family of perennial, flowering plants in the monocot order Arecales. Their growth form can be climbers, shrubs, tree-like and stemless plants, all commonly known as palms. Those having a tree-like form are colloquially c ...

''Phytelephas aequatorialis'', commonly known as Ecuadorian ivory palm, is the main source of

Ecuador Ecuador, officially the Republic of Ecuador, is a country in northwestern South America, bordered by Colombia on the north, Peru on the east and south, and the Pacific Ocean on the west. It also includes the Galápagos Province which contain ...

ean

vegetable ivory Vegetable ivory or Phytelephas, tagua nut is a product made from the very hard white endosperm of the seeds of certain Arecaceae, palm trees. Vegetable ivory is named for its resemblance to ivory, animal ivory. Vegetable ivory is naturally white ...

or tagua, a botanical alternative to

ivory Ivory is a hard, white material from the tusks (traditionally from elephants) and Tooth, teeth of animals, that consists mainly of dentine, one of the physical structures of teeth and tusks. The chemical structure of the teeth and tusks of mamm ...

. It is found in the tropical rainforests of the western Andean slopes of Ecuador. It has a woody trunk which can grow to 20 m in height and very long pinnate leaves.

Description

The plants are

dioecious Dioecy ( ; ; adj. dioecious, ) is a characteristic of certain species that have distinct unisexual individuals, each producing either male or female gametes, either directly (in animals) or indirectly (in seed plants). Dioecious reproduction is ...

, with the female individuals bearing large brown conical fruits, each approximately the size of a

grapefruit The grapefruit (''Citrus'' × ''paradisi'') is a subtropical citrus tree known for its relatively large, sour to semi-sweet, somewhat bitter fruit. The flesh of the fruit is segmented and varies in color from pale yellow to dark red. Grapefru ...

(but occasionally up to in diameter and weighing up to and covered in a horned husk, containing usually four seeds. Immature seeds contain sweet edible pulp. Mature seeds are harder than wood and are encased in a bonelike shell. The

endosperm The endosperm is a tissue produced inside the seeds of most of the flowering plants following double fertilization. It is triploid (meaning three chromosome sets per nucleus) in most species, which may be auxin-driven. It surrounds the Embryo#Pla ...

is a white

hemicellulose A hemicellulose (also known as polyose) is one of a number of heteropolymers (matrix polysaccharides), such as arabinoxylans, present along with cellulose in almost all embryophyte, terrestrial plant cell walls. Cellulose is crystalline, strong, an ...

material that is so hard it can be polished and carved like ivory. The male flowers are in a

catkin A catkin or ament is a slim, cylindrical flower cluster (a spike), with inconspicuous or no petals, usually wind- pollinated ( anemophilous) but sometimes insect-pollinated (as in '' Salix''). It contains many, usually unisexual flowers, arra ...

, and each flower has as many as 1,000

stamens The stamen (: stamina or stamens) is a part consisting of the male reproductive organs of a flower. Collectively, the stamens form the androecium., p. 10 Morphology and terminology A stamen typically consists of a stalk called the filamen ...

,Little and Dixon Arboles Communes loc.cit. the greatest number in any

monocot Monocotyledons (), commonly referred to as monocots, (Lilianae ''sensu'' Chase & Reveal) are flowering plants whose seeds contain only one Embryo#Plant embryos, embryonic leaf, or cotyledon. A monocot taxon has been in use for several decades, but ...

. The plant's

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

name ''Phytelephas'' means "elephant plant". Three other species in this genus are sources of

as well.

Animal consumption

The edible immature seeds are often dispersed by rainforest

rodent Rodents (from Latin , 'to gnaw') are mammals of the Order (biology), order Rodentia ( ), which are characterized by a single pair of continuously growing incisors in each of the upper and Mandible, lower jaws. About 40% of all mammal specie ...

s such as

agouti The agouti (, ) or common agouti is any of several rodent species of the genus ''Dasyprocta''. They are native to Central America, northern and central South America, and the southern Lesser Antilles. Some species have also been introduced else ...

s. In some rural areas the trees are used to attract rodents, which are then captured for their meat. Animals that feed on the fleshy

mesocarp 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. Fruitlike structures may develop directly from the seed itself rather tha ...

of the palm's fruit include squirrels ('' Sciurus aestuans''),

s ('' Dasyprocta'' spp.), deer (''

Odocoileus virginianus The white-tailed deer (''Odocoileus virginianus''), also known commonly as the whitetail and the Virginia deer, is a medium-sized species of deer native to North, Central and South America. It is the most widely-distributed mainland ungulate ...

''),

opossum Opossums () are members of the marsupial order Didelphimorphia () endemic to the Americas. The largest order of marsupials in the Western Hemisphere, it comprises 126 species in 18 genera. Opossums originated in South America and entered North A ...

s (''

Marmosa The 27 species in the genus ''Marmosa'' are relatively small Neotropical members of the family Didelphidae. This genus is one of three that are known as mouse opossums. The others are '' Thylamys'' (the "fat-tailed mouse opossums") and '' Tlacu ...

'' spp.),

porcupine Porcupines are large rodents with coats of sharp Spine (zoology), spines, or quills, that protect them against predation. The term covers two Family (biology), families of animals: the Old World porcupines of the family Hystricidae, and the New ...

s ('' Coendou'' spp.), and ''

Cuniculus paca The lowland paca (''Cuniculus paca''), also known as the spotted paca, is a large rodent found in tropical and sub-tropical America, from east-central Mexico to northern Argentina, and has been introduced to Cuba and Algeria. The animal is call ...

''.

Cultivation

The palms are occasionally cultivated as a

cash crop A cash crop, also called profit crop, is an Agriculture, agricultural crop which is grown to sell for profit. It is typically purchased by parties separate from a farm. The term is used to differentiate a marketed crop from a staple crop ("subsi ...

. International conservation organizations pay farmers for

in hopes that interest in the product will lead to resources being allotted for the protection of rainforests and the preservation of its flora. Due to its commercial usefulness, the trees were usually preserved when rainforest was cleared for agricultural use.

References

External links

Some information and photos of Tagua

Some information and photos of Tagua
* * * {{Taxonbar, from=Q2709988 aequatorialis Trees of Ecuador Near threatened plants

Description

Animal consumption

Cultivation

See also

References

External links