This topic might have a better name.

Phylox series, because it is only ever referred to that way.

Talk about it here.

The Andromedan Phylox Series was, according to the TARDIS data bank, a series of planets in either the Andromeda constellation or galaxy. Nyssa explained to the Fifth Doctor that Castrovalva was "in Andromeda. A small planet of the Phylox series." (TV: Castrovalva)

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