quebracho


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Related to quebracho: lignum vitae, Lignum vitæ

quebracho

(kābrä`chō), name for a tanning substance and for the trees from which it comes, chiefly the red quebracho, or quebracho colorado (Schinopsis lorentzii), of the family Anacardiaceae (sumacsumac
or sumach
, common name for some members of the Anacardiaceae, a family of trees and shrubs native chiefly to the tropics but ranging into north temperate regions and characterized by resinous, often acrid, sap.
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 family). This hardwood tree, native to the Paraguayan subtropics, supplies one of the most durable and heavy of timbers. It also provides much of the vegetable tannin for the leather industry although the populations are being depleted. The heartwood, stripped of its bark and subjected to extraction processes, is about 30% tannin. Quebracho is obtained chiefly from wild trees of the forests of the Gran Chaco of Argentina, Paraguay, and Bolivia. White quebracho (Aspidosperma quebracho-blanco) of the dogbanedogbane,
common name for some members of the Apocynaceae, a family of herbs, shrubs, and trees found in most parts of the world but especially in the tropics, where they are often climbing forms. Many species are native to or naturalized in North America.
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 family is one of the other hardwoods similarly used and is native to the same region. Red quebracho is classified in the division MagnoliophytaMagnoliophyta
, division of the plant kingdom consisting of those organisms commonly called the flowering plants, or angiosperms. The angiosperms have leaves, stems, and roots, and vascular, or conducting, tissue (xylem and phloem).
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, class Magnoliopsida, order Sapindales, family Anacardiaceae.

Quebracho

 

the name of several subtropical species of South American trees and of their wood, bark, and tanning extracts. The species Schinopsis balansae and S. quebracho-colorado (also known as S. lorentzii) of the family Anacardiaceae have a hard heavy wood containing approximately 20 percent tannins. The bark of Aspidosperma quebracho-bianco of the family Apocynaceae contains alkaloids (the most active, yohimbine) and approximately 25 percent tannins.

quebracho

[kā′bra·chō]
(botany)
Any of a number of South American trees in different genera in the order Sapindales, but all being a valuable source of wood, bark, and tannin.
(materials)
A drilling-fluid additive used for thinning or dispersing in order to control viscosity and thixotropy; made from an extract of the quebracho tree and consisting essentially of tannic acid.
References in periodicals archive ?
Para esses mesmos descritores aromaticos, o tanino de quebracho superou o de castanheira, mas nao o tratamento controle; excecao ao aroma de cafe, no qual o controle foi superior aos vinhos tratados com esse tanino.
visco (Fabaceae), 33%, seguida por Geoffroea decorticans (Fabaceae), 18% y en menor proporcion los generos Aspidosperma quebracho blanco (Apocinaceae), 9%, Cinnamomum aff.
* Flotacion de fluorita con reactivos especificos para minerales[4] no metalicos: R-765, quebracho, dextrina.
Condensed tannins are known for their wide distribution in nature and for their substantial concentration in the wood and bark of various softwood and hardwood trees, including various acacia (South African wattle of mimosa bark extract), Schinopsis (Argentina quebracho wood extract), Tsuga (hemlock bark extract) and Pinus (pine bark extracts) species.
Los latifundios perifericos dedicados a la explotacion del quebracho obstaculizaron el avance colonizador que debio esperar el momento propicio para acceder a las tierras del interior fiscal, donde se fueron creando las pequenas colonias agricolas.
Descripcion del cecidomiido productor de la agalla del Quebracho blanco.
(2006), hallaron que la especie forestal quebracho blanco (Aspidosperma sp.) (Apocynaceae), presenta un porcentaje de pureza del 99.9%.
And around 50 members of a group calling itself Quebracho - which claims sovereignty of the Falklands - staged a march and demanded that their government cuts trade links with Britain.
(1979): 1) fragmentos de bosque chaqueno con presencia de quebracho blanco (Aspidosperma quebrachoblanco), chanares (Geoffroea decorticans), y especies arbustivas halofilas como el cachiyuyo (Atriplex sp.), los jumes (Hetterostachys sp.
Esta degradacion se evidencia por ejemplo, en el menor numero de ejemplares arboreos en Los Alisos, como es el caso del quebracho colorado del cual solo se contabilizo un ejemplar.
En la zona quemada de un ano la cobertura de Lithrea molleoides "molle de beber" fue del 11 % y Schinopsis haenkeana "horco quebracho" el 4 %.