Question: Do Sinningia or Elodea have more species?

Context paragraphs:
Sinningia speciosa: Sinningia speciosa, commonly known in the horticultural trade as Gloxinia, is a tuberous member of the flowering plant family Gesneriaceae.  The common name has persisted since its original introduction to cultivation from Brazil in 1817 as "Gloxinia speciosa".  The name florist's gloxinia is sometimes used to distinguish it from the rhizomatous species now included in the genus "Gloxinia".  Another common name is Brazilian gloxinia.  The plants produce large, velvety, brightly colored flowers and are popular houseplants.  Cultural requirements are similar to those of African violets except that "S. speciosa" generally requires more light and often has a dormant period, when the tuber should be kept cool and dry until it resprouts.

Elodea: Elodea is a genus of 6 species of aquatic plants often called the waterweeds described as a genus in 1803.  "Elodea" is native to North and South America and is also widely used as aquarium vegetation.  It lives in fresh water.

Elodea nuttallii: Elodea nuttallii is a species of waterweed known by the common name western waterweed or Nuttall's waterweed.  This is a perennial aquatic plant which is native to North America where it grows submersed in lakes, rivers, and other shallow water bodies.  It is also found in Eurasia, where it is commonly weedy; it is not known as a weed species in its native range.  It is sometimes used as an aquarium plant.

Sinningia: Sinningia is a genus of flowering plants in the family Gesneriaceae.  It is named after Wilhelm Sinning (1792-1874), a gardener of the Botanische Gärten der Friedrich-Wilhelms-Universität Bonn.  There are about 65 species of tuberous herbaceous perennials, all occurring in Central and South America, with the greatest concentration of species occurring in southern Brazil.

Edwards Run: Edwards Run is a 7.9 mi tributary stream of the Cacapon River, belonging to the Potomac River and Chesapeake Bay watersheds.  The stream is located in Hampshire County in the U.S. state of West Virginia's Eastern Panhandle.  Edwards Run is named for Joseph Edwards and his family, whose plantation encompassed most of the stream's course.  George Washington surveyed his property in the late 1740s.  It is a major source of various species of elodea.

Supporting paragraphs: Sinningia Elodea
Answer: Sinningia