Question: Which genus has more species: Heracleum or Dirca?

Context paragraphs:
Heracleum (plant): Heracleum is a genus of about 60 species (depending on taxonomic interpretation) of biennial and perennial herbs in the carrot family Apiaceae.  They are found throughout the temperate northern hemisphere and in high mountains as far south as Ethiopia.  Common names for the genus or its species include hogweed and cow parsnip.

Dirca: Dirca is a genus of three or four species of flowering plants in the family Thymelaeaceae, native to North America.  The genus is named after Dirce in Greek mythology.  The general common name for this deciduous shrub is leatherwood; other names include moosewood, ropebark and Powhatan-derived wicopy.  The stems of "Dirca" are exceptionally pliable and the bark is difficult to tear by hand; for this reason, its stems were used by Native Americans in eastern North America as thongs or ropes.  Members of the genus can grow to a maximum height of about three meters, and are often associated with rich, moist woods or slopes above creeks or streams.

Supporting paragraphs: Heracleum (plant) Dirca
Answer: Heracleum