Question: Which plant genus is part of a family with a longer name, Exochorda or Selago?

Context paragraphs:
Acanthopale: Acanthopale is a plant genus in the Acanthaceae plant family.  The genus name is based on the classic Greek words for thorn "ákantha" and stake "palum".  Some species in the genus are cultivated as ornamental plants.

Aldrovanda vesiculosa: Aldrovanda vesiculosa, commonly known as the waterwheel plant, is the sole extant species in the flowering plant genus "Aldrovanda" of the family Droseraceae.  The plant captures small aquatic invertebrates using traps similar to those of the Venus flytrap.  The traps are arranged in whorls around a central, free-floating stem, giving rise to the common name.  This is one of the few plant species capable of rapid movement.

Mira (given name): Mira is a feminine given name with varying meanings.  Mira or mera surname or family title Sylheti speaking muslim community in Sylhet Division of Bangladesh  & Barak Valley of Assam .  In the Romance languages, it is related to the Latin words for "wonder" and "wonderful."  In the various Slavic languages, it means "peace" and is often used as part of a longer name, such as Miroslava (masculine form: Miroslav) or Sławomira (masculine form: Sławomir).  In Albanian language, it means "goodness" or "kindness".  In Sanskrit, it means "ocean", "sea", "limit" or "boundary" In Hebrew, it is a derivative of Miriam or the female equivalent of Meir, meaning light.

Nicoletta (singer): Nicoletta Grisoni, longer name Nicole Fernande Grisoni-Chappuis, better known by her mononym Nicoletta (born 11 April 1944 in Vongy, now known as Thonon-les-Bains, Haute-Savoie, France) is a French pop singer.  Becoming very popular on French radio and television, where she had a number of hits in the 1960s and the 1970s, she was considered as part of what is known as the French yé-yé generation heavily influenced by American music, particularly Rhythm and blues, Rock and roll and Beat music.  She is mostly known for her version of "Mamy Blue".

Cecinothofagus: Cecinothofagus is a genus of flies.  Its name is derived from cecidium and "Nothofagus", the name of the host plant genus.  This genus differs from "Paraulax" by a median vertical carina that extends from the ventral margin of the clypeus, almost reaching the ventral margin of the antennal sockets; its facial strigae radiating from the lateral clypeus; the ventral part of its clypeus is straight; a lateral, sharp occipital carina is present; its last antennal flagellomere is 1.5 to 1.7 times longer than wide; longitudinal costulae running from the lateral margin of its pronotal plate to the lateral surface of its pronotum are very short or absent altogether; notauli are sinuate; no scutellar foveae are present; simple claws, sometimes carrying a short basal lobe.

Centaurea: Centaurea ( ) is a genus of between 350 and 600 species of herbaceous thistle-like flowering plants in the family Asteraceae.  Members of the genus are found only north of the equator, mostly in the Eastern Hemisphere; the Middle East and surrounding regions are particularly species-rich.  Common names for this genus are centaury, centory, starthistles, knapweeds, centaureas and the more ambiguous "bluets"; a vernacular name used for these plants in parts of England is "loggerheads" (common knapweed).  The "Plectocephalus" group – possibly a distinct genus – is known as basketflowers.  "Cornflowers" is used for a few species, but that term more often specifically means "C. cyanus" (sometimes also called "basket flower").  The common name "centaury" is sometimes used, although this also refers to the unrelated plant genus "Centaurium".

Ipheion: The flowering plant genus Ipheion (starflower, spring starflower) belongs to Allioideae subfamily of the Amaryllidaceae family.  The World Checklist of Selected Plant Families no longer recognize the genus, regarding it as a synonym of "Tristagma", although The Plant List accepts two species.

Broek, Gouda: Broek was a municipality in the Dutch province of South Holland, located west and north of Gouda.  A longer name of the municipality, Broek, Bloemendaal, Broekhuizen, Thuil en het Weegje names the polders that are part of the municipality.

Exochorda: Exochorda is a small genus of flowering plants in the family Rosaceae, native to China and central Asia (Turkestan).  They are used as ornamental plants with the common name pearl bush, or pearlbush.  Numerous species have been described on the basis of differing appearance and geographical separation, but a systematic study revealed that the different types are closely related and probably all descended from a single species that formerly had a wide distribution that has been fragmented by habitat loss.  As a single species the correct name is "E. racemosa".

Selago: Selago is a genus of plant in family Scrophulariaceae, closely related to "Scrophularia" and "Verbascum".  It contains around 190 species, mostly in southern Africa; two are listed on the IUCN Red List:

Supporting paragraphs: Exochorda Selago
Answer: Selago