quebracho

(redirected from quebrachos)
Also found in: Dictionary, Medical.

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.
..... Click the link for more information.
 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.
..... Click the link for more information.
 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).
..... Click the link for more information.
, 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 ?
En los bosques con dosel continuo (de quebrachos y serrano) los taxones superiores mas abundantes fueron Hemiptera, Hymenoptera y Coleoptera.
Bosques Quebrachos Quebrachos Secundario (MQ) (SL) (SI) Abundancia 179 242 156 Media 59.
Se emitieron en valores de 1,2, 5, 10, 20, 50 y 100, al igual que la nominacion de la moneda nacional, por lo que un quebracho no solo equivalia nominalmente a un peso convertible sino que cualquier billete de la moneda nacional tenia su equivalente en quebracho.
Sobre la base de esta normativa, el Decreto Provincial No 1690/01, autorizo la emision de la serie I de Quebracho hasta la suma de 50 millones de pesos, con plazo de un ano y seis meses contados desde la fecha de emision y una tasa de interes nominal anual de 8% a pagar en dos cuotas, la primera un ano despues de la emision y la segunda juntamente con el capital al vencimiento del plazo.
El crecimiento del Quebracho es lento y tienen una durabilidad de 15-18 anos.
Nombres comunes: Quebracho colorado Santiagueno, Quebracho Santiagueno, Paag, Paaj, Maasif Taining, Maskoy, Horco quebracho.
La linea ferroviaria dio nacimiento a una cadena de pueblos estables con intensa actividad forestal basada en la explotacion de madera de quebracho y de tanino, en la obtencion de durmientes, postes de alambrado y lena.
Los pueblos que se desarrollaron en funcion del quebracho tuvieron formas de asentamiento identicas a los tipos ya descriptos, basadas principalmente en una trama en cuadricula donde las estaciones de ferrocarril ocuparon un lugar centralizado.
La vegetacion es un bosque secundario ralo de dos quebrachos Schinopsis lorentzii y Aspidosperma quebrachoblanco, con un estrato arboreo secundario de Ziziphus mistol, Cercidium praecox, Capparis atamisquea.
Es un bosque secundario de dos quebrachos donde predomina Schinopsis lorentzii, quebracho colorado.
300 aprovechables (= 7%), el resto esta degradado o desaparecido (21); en esta provincia y hasta 1941 se habian cortado 150 millones de arboles de quebracho colorado, ademas de algarrobos y otras especies valiosas madereras.
Quebracho colorado (Schinopsis balansae) Arbol grande, llega a los 25 mtrs.