Question: Which plant genus contain two to four species, Greyia or Calycanthus?

Context paragraphs:
Fanniomyces: Fanniomyces is a genus of fungi in the family Laboulbeniaceae.  The genus contain two species.

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".

Thecaphora: Thecaphora is a genus of Basidiomycote Fungus which contains several species of plant pathogens.  The widespread genus contain 57 species.

Bolitoglossa: Bolitoglossa is a genus of lungless salamanders, also called mushroom-tongued salamanders tropical climbing salamanders or web-footed salamanders, in the family Plethodontidae.  Their range is between northern Mexico through Central America to Colombia, Venezuela, Ecuador, Peru, northeastern Brazil, and central Bolivia.  Neotropical salamanders of the "Bolitoglossa" genus make up the largest genus in the order Caudata, consisting of approximately one-fifth of all known species of salamanders.  Adult salamanders range anywhere from 45mm to 200mm in length depending on their specific species.  They are notorious for their ability to project their tongue at prey items, as indicated from their name.  They are also known for their webbed feet, having significantly more webbing than any other species outside their genus with the exception of the cave-dwelling Mexican bolitoglossine "Chiropterotriton magnipes".  Although webbed feet are a common characteristic of these salamanders, only about half of the species in this genus contain webbed feet.

Greyia: Greyia is a genus of plant in family Melianthaceae.  It contains three species:

Arthromyces: Arthromyces is a genus of fungi in the Lyophyllaceae family.  The genus contain two species found in Central America.

Atropellis: Atropellis is a genus of fungi in the Dermateaceae family.  The genus contain four species.

Ulocladium: Ulocladium is a genus of fungi.  Species of this genus contain both plant pathogens and food spoilage agents.  Other species contain enzymes that are biological control agents.

Pterosporidium: Pterosporidium is a genus of fungi in the Phyllachoraceae family.  The genus contain two widely distributed species that grow on mangrove leaves.

Palifer: Palifer is a genus of corticioid fungi in the Schizoporaceae family.  Circumscribed in 1991, the widely distributed genus contain four species.

Supporting paragraphs: Greyia Calycanthus
Answer: Calycanthus