Suerte! :)

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Note added at 8 mins (2009-05-15 17:28:45 GMT)
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Produce certain plant forms. Numerous horticultural plants owe their beauty to the fact that they are grafted or budded onto a **standard***, especially those that have a weeping or cascading form. Examples include weeping hemlock (Tsuga canadensi.3, Carr. var. pendula, Beissn.), which is grafted onto seedling hemlock rootstock (Tsuga canadensis, Carr.); weeping flowering cherry (Prunus subhietella var. pendula, Tanaka), which is grafted onto Mazzard cherry rootstock (Prunus avium, L.); and weeping dogwood (Cornus florida, L. var. pendula, Dipp.), which is grafted onto flowering dogwood rootstock (Cornus florida, L.). In most cases, multiple scions are grafted or budded 3 feet or higher on the main stem of the rootstock. When used this way, the rootstock is referred to as a **standard***.
http://www.ces.ncsu.edu/depts/hort/hil/ag396.html

It may be an optimistic opinion of the authors regarding the future of new varieties (Martin, 1993), but if they are to play an important future role, it is likely that growers will topwork, rather than planting new trees. The alternative spring green-bark topworking system is especially suited for new varieties for several reasons: 1. Many of the high-yielding new varieties have smaller branch size and diameters than the **standard** "Hass"; 2. The limited availability of budwood material of new varieties will require using smaller-diameter material than would otherwise be acceptable, for traditional grafting.

http://www.avocadosource.com/WAC3/WAC3_p217.htm