Lygodium palmatum is the only species of its genus native to North America.
 Unlike most species in the genus, this one, called the American climbing fern (or Hartford fern, after Hartford, Connecticut), is extremely hardy in temperate zones.
Lygodium (climbing fern) is a genus of about 40 species of ferns, native to tropical regions across the world, with a few temperate species in eastern Asia and eastern North America.
 It is the sole genus in the family Lygodiaceae, though included in the family Schizaeaceae by some botanists.
Oemleria cerasiformis, a shrub commonly known as osoberry or Indian plum, is the sole species in genus Oemleria.

Question: Which genus has more species, Oemleria or Lygodium?
Answer: Lygodium