Question: Which genus has more species, the Catharanthus or the Bosea?

Context paragraphs:
Catharanthus roseus: Catharanthus roseus, commonly known as the Madagascar periwinkle, rosy periwinkle or teresita as it is usually named in the southern part of Mexico, specifically in Champotón, Campeche and Mérida, is a species of flowering plant in the dogbane family Apocynaceae.  It is native and endemic to Madagascar, but grown elsewhere as an ornamental and medicinal plant, a source of the drugs vincristine and vinblastine, used to treat cancer.  Other English names include "Vinca", Cape periwinkle, rose periwinkle, rosy periwinkle, and "old-maid".  It was formerly included in the genus "Vinca" as "Vinca rosea".

Catharanthus: Catharanthus is a genus of flowering plants in the dogbane family, Apocynaceae.  Like genus "Vinca", they are known commonly as periwinkles.  There are eight known species.  Seven are endemic to Madagascar, though one, "C. roseus", is widely naturalized around the world.  The eighth species, "C. pusillus", is native to India and Sri Lanka.  The name "Catharanthus" comes from the Greek for "pure flower".

Bosea (plant): Bosea The genus of evergreen, woody shrubs contains 3 species that are geographically widely separated; one in the Canary Islands, one in Cyprus and one in the western Himalayas.  The species have many crowded cane-like stems from ground level grow to medium to tall shrubs, smallish simple leaves with smooth margins, and tiny white-to-green flowers in branched spikes at end of branches.  The fruits are small berries, which have varied local uses as food plants and in traditional medicine.

Bosea thiooxidans: Bosea thiooxidans is a gram-negative species of bacteria that oxidises thiosulfate, the type species of its genus.  Its type strain is BI-42.

Supporting paragraphs: Catharanthus Bosea (plant)
Answer: Catharanthus