Question: Which Genus has more species Darmera or Roystonea ?

Context paragraphs:
Roystonea: Roystonea is a genus of eleven species of monoecious palms, native to the Caribbean Islands, and the adjacent coasts of Florida and Central and northern South America.  Commonly known as the royal palms, the genus was named for Roy Stone, a U.S. Army engineer.  It contains some of the most recognizable and commonly cultivated palms in tropical and subtropical regions.

Darmera: Darmera peltata (Indian rhubarb or umbrella plant) is a flowering plant, the only species within the genus Darmera in the family Saxifragaceae.  It is a slowly spreading rhizomatous perennial native to mountain streamsides in woodland in the western United States (southwestern Oregon to northwestern California), growing to 2 m tall by 1 m wide.  The name "Darmera" comes after Karl Darmer, a Berlin horticulturist from 19th century.

Roystonea dunlapiana: Roystonea dunlapiana, commonly known as yagua or cabiche is a species of palm which is native to Nicaragua, Honduras, and southern Mexico (Chiapas, Campeche, Quintana Roo, Tabasco, Veracruz).  It is the only species in the genus "Roystonea" which is absent from the insular Caribbean.

Roystonea altissima: Roystonea altissima is a species of palm which is endemic to hillsides and mountain slopes near the interior of Jamaica.  The name "altissima" is Latin for "highest", however they are not the tallest species in the genus "Roystonea".  They are usually found just over sea-level to 760 m in elevation.

Supporting paragraphs: Roystonea Darmera
Answer: Roystonea