Question: Does Roystonea or Dionysia have more species?

Context paragraphs:
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 stellata: Roystonea stellata is a species of palm endemic to Yagruma terrace in the Maisí region of Guantánamo Province in eastern Cuba.  The species is known from only a single collection made by French-born botanist Frère León in 1939, and may be extinct.

Roystonea violacea: Roystonea violacea is a species of palm which is endemic to the Maisí region of Guantánamo Province in eastern Cuba.

Roystonea maisiana: Roystonea maisiana is a species of palm which is endemic to the Maisí region of Guantánamo Province in eastern Cuba.

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.

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.

Roystonea regia: Roystonea regia, commonly known as the Cuban royal palm or the Florida royal palm is a species of palm which is native to Mexico and parts of Central America and the Caribbean.  A large and attractive palm, it has been planted throughout the tropics and subtropics as an ornamental tree.  Although it is sometimes called "R. elata", the conserved name "R. regia" is now the correct name for the species.  Populations in Cuba and Florida were long seen as separate species, but are now considered to belong to a single species.

Dionysia (plant): Dionysia is a genus containing 49 species of flowering plants in the family Primulaceae.  They are small, cushion-forming alpines native to mountains in central Asia.  They are usually evergreen perennials with felted leaves, covered with bright yellow or pink, five-petalled flowers in spring.  They are often difficult to cultivate if the correct conditions are not provided.

Roystonea palaea: Roystonea palaea is an extinct species of palm known from fossil flowers found in the early Miocene Burdigalian stage Dominican amber deposits on the island of Hispaniola.  The species is known from a single staminate flower and a single pistillate flower both preserved in the same piece of amber.  The amber specimen bearing the holotype and paratype is currently deposited in the collections of the Oregon State University in Corvallis, Oregon, as number "Sd–9–101", where it was studied and described by Dr George Poinar.  Dr Poinar published his 2002 type description for "R. palaea" in the "Botanical Journal of the Linnean Society", Volume 139.  The species' second name is taken from the Greek word "palaios" meaning "ancient".  The amber specimen bearing the flowers was excavated from the La Toca mine northeast of Santiago de los Caballeros, Dominican Republic.

Junghuhnia kotlabae: Junghuhnia kotlabae is a species of crust fungus in the family Steccherinaceae.  It was described as a new species by Czech mycologist Zdenek Pouzar in 2003.  The fungus, found in Cuba, was collected from a fallen stem of the Cuban royal palm ("Roystonea regia").  Distinguishing characteristics include the effuso-reflexed fruit bodies (mostly crust-like but with caps forming along the upper edge), broad spores, and two types of cystidia.

Supporting paragraphs: Roystonea Dionysia (plant)
Answer: Dionysia