Question: Which genus has more species, Platycodon or Juncus?

Context paragraphs:
Platycodon: Platycodon grandiflorus (from Ancient Greek πλατύς "wide" and κώδων "bell") is a species of herbaceous flowering perennial plant of the family Campanulaceae, and the only member of the genus Platycodon.  It is native to East Asia (China, Korea, Japan, and the Russian Far East).  It is commonly known as balloon flower (referring to the balloon-shaped flower buds), Chinese bellflower, or platycodon.

Aquamarina: Aquamarina is a fungal genus in the class Dothideomycetes.  It is a monotypic genus, containing the single marine species Aquamarina speciosa, originally found in North Carolina, and distributed in the Atlantic Coast of the United States.  The bluish-green species fruits exclusively in the lower parts of dying culms of the saltmarsh plant "Juncus roemerianus".

Juncus: Juncus is a genus of monocotyledonous flowering plants, commonly known as rushes.  It is the largest genus in the family Juncaceae, containing around 300 species.

Papulosaceae: The Papulosaceae are a family of fungi in the class Sordariomycetes.  The family has not been assigned to any order ("incertae sedis").  A monotypic taxon, the Papulosaceae contain the single genus Papulosa, which in turn contains the single species Papulosa amerospora.  This species, found in the eastern USA, grows in "Juncus" stems.

Juncaceae: Juncaceae is a family of flowering plants, commonly known as the rush family.  It consists of 8 genera and about 464 known species of slow-growing, rhizomatous, herbaceous monocotyledonous plants that may superficially resemble grasses and sedges.  They often grow on infertile soils in a wide range of moisture conditions.  The best-known and largest genus is "Juncus".  Most of the "Juncus" species grow exclusively in wetland habitats.  A few rushes, such as "Juncus bufonius" are annuals, but most are perennials.

Junco: A junco , genus Junco, is a small North American bird.  Junco systematics are still confusing after decades of research, with various authors accepting between three and twelve species.  Despite having a name that appears to derive from the Spanish term for the plant genus "Juncus" (rushes), these birds are seldom found among rush plants, as these prefer wet ground, while juncos like dry soil.

Supporting paragraphs: Platycodon Juncus
Answer: Juncus