Triplaris americana

Triplaris americana is a species of flowering plant in the knotweed family known by many common names, including ant tree[1] or pau-formiga ("ant tree"),[2] guacamayo, guayabo zancón, hormiguero, palo de Santa María, tachí, vara santa,[3] pau-de-novato, formigueiro, and taxizeiro.[2] It is native to Central and South America, occurring from Panama to Brazil.[1] It is also cultivated as an ornamental for its showy pink flowers.[4]

This species is a tree growing up to 30 meters in height with a trunk diameter reaching 30 centimeters. The smooth bark is a mottled gray color. There are ochrea up to 12 centimeters in length. The leaves are oval to oblong and measure up to 40 centimeters long by 20 wide. The undersides are sometimes woolly with brown fibers. The tree is dioecious. The male flowers are around 2 millimeters long, while the female flowers are up to 5 centimeters long.[1] The sex ratio of the species is skewed, with many more female plants than male.[5]

This tree grows in riparian habitat types. It is a colonizer of disturbed habitat.[5] It has been introduced to areas outside its native range, including Hawaii[1] and southern Africa.[4]

This species is a myrmecophyte, forming a mutualistic relationship with ants. Ants living on the plant include Pseudomyrmex triplarinus. This species lives within the tree, feeding on substances produced by it, and defending it against invaders.[6] This tree is known as a "novice tree" (pau-de-novato) because only one unfamiliar with the tree would touch it, soon discovering that the ants are aggressive and venomous.[2]

This tree is considered a noxious weed in southern Africa.[1] The fruits are dispersed on the wind and the seedlings easily take hold and become invasive, growing in the local habitat and displacing native plants.[4]

Ant tree
Flickr - João de Deus Medeiros - Triplaris americana
Triplaris americana, vroulike blomme, Ballito, a
female flowers
Scientific classification
Kingdom: Plantae
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Polygonaceae
Genus: Triplaris
T. americana
Binomial name
Triplaris americana


  1. ^ a b c d e Triplaris americana. Pacific Island Ecosystems at Risk.
  2. ^ a b c Haddad Junior, V., et al. (2009). The Triplaria tree (Triplaris spp) and Pseudomyrmex ants: a symbiotic relationship with risks of attack for humans. Revista da Sociedade Brasileira de Medicina Tropical 42 6.
  3. ^ Triplaris americana. Catálogo de la Biodiversidad de Colombia.
  4. ^ a b c Ant tree (Triplaris americana) is: Beautiful.......but dangerous!. Southern African Plant Invaders Atlas, April 2010.
  5. ^ a b Melampy, M. N. and H. F. Howe. (1977). Sex ratio in the tropical tree Triplaris americana (Polygonaceae). Evolution 31 867-72.
  6. ^ Bakalar, N. Polite guests, ants pick host trees out of a crowd. New York Times May 13, 2011.
10th edition of Systema Naturae

The 10th edition of Systema Naturae is a book written by Swedish naturalist Carolus Linnaeus and published in two volumes in 1758 and 1759, which marks the starting point of zoological nomenclature. In it, Linnaeus introduced binomial nomenclature for animals, something he had already done for plants in his 1753 publication of Species Plantarum.

Cordillera Azul National Park

Cordillera Azul National Park (Spanish: Parque Nacional Cordillera Azul) is a protected area in Peru. It protects part of the Ucayali moist forests ecoregion.


Pseudomyrmex is a genus of stinging, wasp-like ants in the subfamily Pseudomyrmecinae. They are large-eyed, slender ants, found mainly in tropical and subtropical regions of the New World.


Triplaris is a genus of plants in the family Polygonaceae. Ant tree is a common name for plants in this genus.The species are variously distributed in the Americas. Some species are used for lumber.

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