Question: Which genus has more known species, Cissus or Digitalis?
Context: Digitalis ( or ) is a genus of about 20 species of herbaceous perennials, shrubs, and biennials commonly called foxgloves. Arcobacter is a genus of Gram-negative, spiral-shaped bacteria in the epsilonproteobacteria class.  It shows an unusually wide range of habitats, and some species can be human and animal pathogens.  Species of the genus "Arcobacter" are found in both animal and environmental sources, making it unique among the epsilonproteobacteria.  This genus currently consists of five species: "A. butzleri", "A. cryaerophilus", "A. skirrowii", "A. nitrofigilis", and "A. sulfidicus", although several other potential novel species have recently been described from varying environments.  Three of these five known species are pathogenic.  Members of this genus were first isolated in 1977 from aborted bovine fetuses.  They are aerotolerant, "Campylobacter"-like organisms, previously classified as "Campylobacter".  The "Arcobacter" genus, in fact, was created as recently as 1992.  Although they are similar to this other genus, "Arcobacter" species can grow at lower temperatures than "Campylobacter", as well as in the air, which "Campylobacter" cannot. Digitalis obscura is a flowering plant, commonly known as the Sunset Foxglove or Willow-leaved Foxglove.  It is native to regions in Spain and Africa, but can be grown as an ornamental flower around the world.  It is a perennial woody plant belonging to the family Plantaginaceae.  (Along with the other foxgloves it used to be placed in the figwort family, Scrophulariaceae; however, recent genetic research has moved the genus "Digitalis" to a larger family.)  The Sunset Foxglove is similar to many of the foxglove species in its high toxicity and medicinal use as a source for the heart-regulating drug digitalis.  Its strikingly distinctive amber- to copper-colored flowers give the species its name and help distinguish it from other members of the genus. Termitaphididae, occasionally called termite bugs, is a small tropicopolitan family of true bugs placed in the superfamily Aradoidea.  Typically members of Termitaphididae are small, being an average of 2 mm -4 mm , and flattened with laminae extending out from each body segment giving a round scale like appearance.  Currently the family contains two genera and twelve known species.  Members of Termitaphididae are inquilines lodging in the nests of host species of termite families Termitidae and Rhinotermitidae.  Though considered a separate family in Aradoidea it has been suggested by Drs David Grimaldi and Michael Engel in 2008 that Termataphididae may in fact be highly derived members of Aradidae.  Of the thirteen known species one "Termitaphis circumvallata" belongs to the monotypic genus "Termitaphis" and four of the remaining eleven species in "Termitaradus" are extinct, having only been found in amber.  The living species are found worldwide in the tropical regions of Central and South America, Africa, Asia, and Australia. Moniezia a genus of tapeworms that are parasitic in mammals, including sheep, goat and cattle.  It comprises four known species such as "M. expansa", "M. benedeni", "M. autumnalis" and "M. baeri". " M. expansa" is the most well known species within the genus because of its high prevalence.  Members of the genus are among the largest cestodes reaching up to 10 m in length.  They inhabit the small intestine of mammalian host.  Their life cycle is indirect requiring intermediate host, which are oribatid mites.  They are characterized by the presence of interproglottid glands. "Cissus antarctica" (synonym "Cissus oblongata"), called "kangaroo vine", is one of the best known species of the genus Cissus in the family of Vitaceae.  It is a climbing plant, a vine, and comes from Australia. 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. Ascaridia is the name of a genus of parasitic nematodes. Members of the genus are primarily intestinal parasites of birds.  There are three well known species, namely, "A. galli" found mostly in chicken, "A. dissimilis" in turkeys, and "A. columbae" in pigeons. Lesser known species such as "A. hermaphrodita", "A. sergiomeirai", "A. ornata", "A. nicobarensis" and "A. platyceri" are found in parrots. Cissus is a genus of approximately 350 species of lianas (woody vines) in the grape family (Vitaceae).  They have a cosmopolitan distribution, though the majority are to be found in the tropics. Cissus tuberosa is a species of the "Cissus" genus in the Vitaceae (or commonly known as grape) family.  It is also incorrectly known as "Vitis" "tuberosa".
Answer: Cissus