Question: Which genus has more species, Lagunaria or Lavatera?

Context paragraphs:
Malva: Malva is a genus of about 25–30 species of herbaceous annual, biennial, and perennial plants in the family Malvaceae (of which it is the type genus), one of several closely related genera in the family to bear the common English name mallow.  The genus is widespread throughout the temperate, subtropical and tropical regions of Africa, Asia and Europe.  The word "mallow" is derived from Old English "malwe", which was imported from Latin "malva", cognate with Ancient Greek μαλάχη (malakhē) meaning "mallow", both perhaps reflecting a Mediterranean term.  A number of species, previously considered to belong to "Lavatera", have been moved to "Malva".

Lavatera: Lavatera is a genus of about 25 species of flowering plants in the family Malvaceae, native to the Mediterranean region, central and eastern Asia, North America (California and Mexico) and Australia.  A number of species are naturalized in North America.

Lagunaria: Lagunaria is a monotypic genus in the family Malvaceae.  It is an Australian plant endemic to Lord Howe Island, Norfolk Island and parts of coastal Queensland.  It has been introduced to many parts of the world.  The genus was named for its resemblance to the earlier genus "Laguna" Cav., which was named in honour of Andrés Laguna, a Spanish botanist and a physician to Pope Julius III.

Supporting paragraphs: Lagunaria Lavatera
Answer: Lavatera