In article , Iris Cohen
writes
Juniperus media does not appear a current name, certainly not to the RHS,

Where did they put things like 'Pfitzer's' and 'Blaauw'? What is the rationale
behind not accepting J. xmedia?

'Blaauw' is under _J. chinesis_; most former _J. x media_ are under _J.
x pfitzeriana_. The nomenclature notes for the RHS Plant Finder say of
_J. x media_

"Juniperus x media This name is illegitimate if applied to hybrids of J.
chinensis x J. sabina, having been previously used for a different
hybrid (P.A. Schmidt, IDS Yearbook 1993, 47-48). Because of its
importance to gardeners, a proposal to conserve its present use was
tabled but subsequently rejected."

_J. x pfitzeriana_ presumably is a name introduced to fill the gap.
--
Stewart Robert Hinsley