Question: Which genus includes more species of flowering plants, Damasonium or Selinum?

Context paragraphs:
Olearia: Olearia is a genus of flowering plants belonging to the family Asteraceae.  There are about 130 different species within the genus found mostly in Australia, New Guinea and New Zealand.  The genus includes herbaceous plants, shrubs and small trees.  The latter are unusual among the Asteraceae and are called "tree daisies" in New Zealand.  All bear the familiar daisy-like composite flowerheads.

Fallopia: Fallopia is a genus of about 12–15 species of flowering plants in the buckwheat family, often included in a wider treatment of the related genus "Polygonum" in the past.  The genus is native to temperate and subtropical regions of the Northern Hemisphere.  The genus includes herbaceous perennial plants, herbaceous vines, and woody vines.

Lantana: Lantana is a genus of about 150 species of perennial flowering plants in the verbena family, Verbenaceae.  They are native to tropical regions of the Americas and Africa but exist as an introduced species in numerous areas, especially in the Australian-Pacific region.  The genus includes both herbaceous plants and shrubs growing to 0.5 - tall.  Their common names are shrub verbenas or lantanas.  The generic name originated in Late Latin, where it refers to the unrelated "Viburnum lantana".

Hibiscus: Hibiscus ( or ) is a genus of flowering plants in the mallow family, Malvaceae.  The genus is quite large, comprising several hundred species that are native to warm-temperate, subtropical and tropical regions throughout the world.  Member species are renowned for their large, showy flowers and are commonly known simply as hibiscus, or less widely known as rose mallow.  The genus includes both annual and perennial herbaceous plants, as well as woody shrubs and small trees.  The generic name is derived from the Greek word ἱβίσκος ("hibískos"), which was the name Pedanius Dioscorides ( 40–90) gave to "Althaea officinalis".

Strychnos: Strychnos is a genus of flowering plants, belonging to family Loganiaceae (sometimes Strychnaceae).  The genus includes about 100 accepted species of trees and lianas, and more than 200 that are as yet unresolved.  The genus is widely distributed around the world's tropics.  The genus is noted for the presence of poisonous indole alkaloids in the roots, stems and leaves of the plant.  Among the alkaloids are strychnine and curare.

Selinum: Selinum is a genus of flowering plant in the family Apiaceae.

Apollonias: Apollonias is a genus of flowering plants belonging to the laurel family, Lauraceae.  The genus includes from one to 10 species of evergreen trees and shrubs, depending on circumscription; recent studies have limited the genus to just one species, with the others transferred to "Beilschmiedia".

Gaura: Gaura is a genus of flowering plants in the family Onagraceae, native to North America.  The genus includes many species known commonly as beeblossoms.  Recent genetic research has shown that the genus is paraphyletic unless the monotypic genus "Stenosiphon" is included within "Gaura", increasing the number of species in the genus to 22.

Damasonium: Damasonium is a genus of six species of flowering plants in the family Alismataceae, commonly known as starfruit and by the older name thrumwort.  The genus has a subcosmopolitan but very patchy distribution.

Pericallis: Pericallis is a small genus of about 14 species of flowering plants in the family Asteraceae, native to the Canary Islands and Madeira.  The genus includes herbaceous plants and small subshrubs.  In the past, the genus was often included in either "Cineraria" or "Senecio.

Supporting paragraphs: Damasonium Selinum
Answer: Damasonium