[Taxacom] Authority with date (zoo) / without date (bot)

rch rch at skynet.be
Mon Sep 28 02:44:56 CDT 2015

In the European Commission's «draft initial list of invasive alien
species of Union concern»
the invasive alien species of animal are listed with authority plus date:-
    Callosciurus erythraeus Pallas, 1779,
    Corvus splendens Viellot, 1817,
    Eriocheir sinensis H. Milne Edwards, 1854,

and the invasive alien species of plant with authority minus date:-
    Baccharis halimifolia L,
    Cabomba caroliniana Gray,
    Eichhornia crassipes (Martius) Solms,

Is this zoo/bot difference usual taxonomic practice, or is there some
other explanation?

Richard H

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