In article , Iris Cohen
writes
However, IPNI only lists L. xeurolepis,
opening the question of whether xmarschlinsii was validly published.

IPNI is not complete. (For example the French flora at INRA has many
synonyms not in IPNI, and I've found other additional synonyms from a
variety of sources.)

Stace (New Flora of the British Isles, 1st edn.) uses _L. x
marschlinsii_. If I interpret his text correctly _L. x eurolepsis_ was
*not* validly published.
--
Stewart Robert Hinsley