December 16
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Grex

All the progeny of a cross between 2 species or 2 other grexes (or a species and a grex), regardless of when and where the crossing occurred; a concept applied in practice in only in a few groups of plants, notably orchid and rhododendron hybrids. A grex name is similar in form to a cultivar name but without quotation marks, and may precede a cultivar name, e.g. Rhododendron Avalanche ?Alpine Glow?. A single grex may include many named cultivars.

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