Question: What is a genus of more species, Cestrum or Bauhinia?

Context paragraphs:
Bauhinia: Bauhinia is a genus of more than 500 species of flowering plants in the subfamily Cercidoideae of the large flowering plant family Fabaceae, with a pantropical distribution.  The genus was named after the Bauhin brothers, Swiss-French botanists.

Bauhinia divaricata: Bauhinia divaricata is a species of flowering shrub of the family Fabaceae.  "B. divaricata" is the type species of the genus "Bauhinia".  One common name for this species is pom pom orchid tree.  It is native to China, Jamaica, India and also grows in the southern half of Florida.  It has white bi-lobed leaves that alternate.

Ernest Edward Galpin: Ernest Edward Galpin (1858–1941), was a South African botanist and banker.  He left some 16,000 sheets to the National Herbarium in Pretoria and was dubbed "the Prince of Collectors" by General Smuts.  Galpin discovered half a dozen genera and many hundreds of new species.  Numerous species are named after him such as "Acacia galpinii", "Bauhinia galpinii", "Cyrtanthus galpinii", "Kleinia galpinii", "Kniphofia galpinii", "Streptocarpus galpinii" and "Watsonia galpinii".  He is commemorated in the genus "Galpinia" N.E.Br.  as is his farm in the genus "Mosdenia" Stent.

Cestrum: Cestrum is a genus of - depending on authority - 150-250 species of flowering plants in the family Solanaceae.  They are native to warm temperate to tropical regions of the Americas, from the southernmost United States (Florida, Texas: day-blooming cestrum, "C. diurnum") south to the Bío-Bío Region in central Chile (green cestrum, "C. parqui").  They are colloquially known as cestrums or jessamines (from "jasmine", due to their fragrant flowers).

Cestrum elegans: Cestrum elegans, the purple cestrum, is a species of flowering plants in the genus "Cestrum".

Supporting paragraphs: Cestrum Bauhinia
Answer: Bauhinia