Question: Which genus has more species, Calycanthus or Wikstroemia?

Context paragraphs:
Calycanthus: Calycanthus (sweetshrub) is a genus of flowering plants in the family Calycanthaceae, endemic to North America.  The genus includes two to four species depending on taxonomic interpretation; two are accepted by the "Flora of North America".

Wikstroemia: Wikstroemia is a genus of 55-70 species of flowering shrubs and small trees in the mezereon family, Thymelaeaceae.  Hawaiian species are known by the common name false ohelo.

Wikstroemia johnplewsii: Wikstroemia johnplewsii, common name Hiva Oa Ohelo, is a plant species endemic to the island of Hiva Oa in the Marquesas Islands, French Polynesia.  It is found at relatively high altitudes in the mountains, at elevations over 600 m.  The only other member of the genus reported from the Marquesas is "W. coriacea" (sometimes erroneously called "W. foetida").  "Wikstroemia coriacea" has narrower leaves and smaller inflorescences than.  "W. johnplewsii".

Supporting paragraphs: Calycanthus Wikstroemia
Answer: Wikstroemia