Listed as Pinus mugo 'Xenie' SS #24 WB in American trade at times, Robert L. Fincham further says: "The correct name is Pinus uncinata 'Xenie'. The rest of the name indicates it was the 24th witches broom of a series collected in the San Sebastian region of northern Bohemia. Milan Halada discovered a marshy area with many specimens of Pinus x pseudopumilio, a hybrid of Pinus mugo and Pinus uncinata. He collected wood from a witch's broom known as San Sebastian #13, which he named Adam. Since then, he and a friend, Jan Beran, have returned many times and collected a variety of witch's brooms in this area. These are found throughout Europe and America as the San Sebastian Series." (November 2, 2006)
Furthermore, taxonomist M.P. Frankis cites in this link (http://www.conifers.org/pi/pin/uncinata.htm) that the first recorded name for the nomenclature of P. uncinata is: Pinus mugo subsp. uncinata thus taking over precedence of any conifer currently being named as P. uncinata.
