Synonym or breeding number (also GM 18-92) for the grape variety Reichensteiner; see there.
The white grape variety (also Geisenheim 18-92, Rajhenstajner) is a new breed between Müller-Thurgau x (Madeleine Angevine x Weißer Calabreser = Calabrisi Bianco), which was confirmed by DNA analyses published in 2012. The name is derived from the castle Reichenstein near Trechtingshausen in the Rheingau. The...
Serious sources on the internet are rare - and Wine lexicon from wein.plus is one such source. When researching for my articles, I regularly consult the wein.plus encyclopaedia. There I get reliable and detailed information.
Thomas Götz
Weinberater, Weinblogger und Journalist; Schwendi