Question: Dahlia and Rondeletia, are a genus of what?

Context paragraphs:
Redmouth whalefish: The redmouth whalefishes are two species of deep-sea whalefishes in the genus "Rondeletia", the only genus in the family Rondeletiidae.  They are apparently close to the velvet whalefish ("Barbourisia rufa"), and apparently also to the gibberfishes (Gibberichthyidae).  The latter and the Rondeletiidae are the only known living fishes which have the mysterious Tominaga's organ.

Rondeletia: Rondeletia is a genus name.  It can refer to:

Dahlia imperialis: Dahlia imperialis or Bell tree dahlia is an 8-10 metre tall member of the Dahlia genus native to Mexico, Central America and Colombia.  It is a plant of the uplands and mountains, occurring at elevations of 1500 - , and its leaves are used as a dietary supplement by the Q'eqchi' people of San Pedro Carchá in Alta Verapaz, Guatemala.

Dahlia pinnata: Dahlia pinnata ("D. x pinnata") is a species in the genus "Dahlia", family Asteraceae, with the common name garden dahlia.  It is the type species of the genus and is widely cultivated.

Dahlia (moth): Dahlia is a genus of moths of the Noctuidae family.

Rondeletia (plant): Rondeletia is a genus of flowering plants in the family Rubiaceae.  It is endemic to the neotropics.  There are around 160 species.

Dahlia: Dahlia ( or ) is a genus of bushy, tuberous, herbaceous perennial plants native to Mexico.  A member of the Asteraceae (or Compositae), dicotyledonous plants, related species include the sunflower, daisy, chrysanthemum, and zinnia.  There are 42 species of dahlia, with hybrids commonly grown as garden plants.  Flower forms are variable, with one head per stem; these can be as small as 2 in diameter or up to 1 ft ("dinner plate").  This great variety results from dahlias being octoploids—that is, they have eight sets of homologous chromosomes, whereas most plants have only two.  In addition, dahlias also contain many transposons—genetic pieces that move from place to place upon an allele—which contributes to their manifesting such great diversity.

List of Dahlia species: There are 42 accepted species in the "Dahlia" genus, according to The Plant List.  The sectional classification of "Dahlia " "sensu" Sørensen (1969) as updated by Saar "et al." (2003) and Hansen (2004) and (2008) is as follows (excluding infraspecific taxa);

Dahlia coccinea: Dahlia coccinea is a species in the genus Dahlia, family Asteraceae.  Common name is "red dahlia" although the flowers can be orange or occasionally yellow as well as the more common red.  The species is native to Mexico but has long been cultivated in other countries for its showy flowers.

Narvalina: Narvalina is a genus of flowering plants in the dahlia tribe within the sunflower family.

Supporting paragraphs: Dahlia Rondeletia (plant)
Answer: plants