Does Laelia or Aster have more species?
Laelia: Laelia is a small genus of 25 species in the orchid family (Orchidaceae). Aster (genus):  Its circumscription has been narrowed, and it now encompasses around 180 species, all but one of which are restricted to Eurasia; many species formerly in "Aster" are now in other genera of the tribe Astereae.
Aster