The spring gentian ("Gentiana verna") is a species of the genus "Gentiana" and one of its smallest members, normally only growing to a height of a few centimetres.
Gentiana is a genus of flowering plants belonging to the gentian family (Gentianaceae), the tribe Gentianeae, and the monophyletic subtribe Gentianinae.
 With about 400 species it is considered a large genus.
 They are notable for their mostly large, trumpet-shaped flowers, which are often of an intense blue.
Peltophorum is a genus of 5–15 species of flowering plants in the family Fabaceae, subfamily Caesalpinioideae.
 The genus is native to certain tropical regions across the world.
 The species are medium-sized to large trees growing up to 15–25 m (rarely 50 m) tall.
Gentiana nivalis (snow gentian or Alpine gentian) is a species of the genus "Gentiana".
 It grows to a height of 3-15 centimetres.
Gentiana olivieri (Chinese: xie wan que qin jiao) is a plant species in the genus "Gentiana" found in Asia.
Gentiana asclepiadea (willow gentian) is a species of flowering plant of the genus "Gentiana" in the family Gentianaceae, native to central and eastern Europe from primarily mountain (montane) woodland though it does occur in less wooded open pasture in some areas, perhaps persisting after woodland clearance.
Tropaeolum majus (garden nasturtium, Indian cress or monks cress) is a flowering plant in the family Tropaeolaceae, originating in the Andes from Bolivia north to Colombia.
 The species has become naturalized in parts of the United States (California, New York, Pennsylvania, New Hampshire, Massachusetts and Connecticut).
 It is of cultivated, probably hybrid origin, with possible parent species including "T. minus", "T. moritzianum", "T. peltophorum", and "T. peregrinum".
 It is not closely related to the genus "Nasturtium" (which includes watercress).
Gentiana pneumonanthe (the marsh gentian) is a species of the genus "Gentiana".
 It was the first wildflower announced as flower of the year in Germany in 1980.
 The species can be found in marshes and moorlands.
 It is the host-plant of the Alcon Blue ("Phengaris alcon").
Peltophorum pterocarpum (commonly known as copperpod, yellow-flamboyant, yellow flametree, yellow poinciana or yellow-flame) is a species of "Peltophorum", native to tropical southeastern Asia and a popular ornamental tree grown around the world.
Gentiana parryi (Parry's gentian) is a species of the genus "Gentiana".
 It is a perennial forb/herb native to Wyoming, Utah, Colorado and New Mexico.

Question: Which has more species Peltophorum or Gentiana?
Answer: Gentiana