Question: Which has more species, Mussaenda or Sanguinaria?
Context: Bremeria is a genus of flowering plants in the Rubiaceae family.  It was described in 2005 to accommodate all the Indian Ocean species formerly placed in "Mussaenda", except the widespread "Mussaenda arcuata".  The genus is indigenous to Madagascar, Mauritius and Réunion, and is found in humid to subhumid evergreen forests. Chelidonium majus, commonly known as greater celandine or tetterwort,(although tetterwort also refers to "Sanguinaria canadensis"), nipplewort, or swallowwort, is a herbaceous perennial plant, the only species in the genus Chelidonium.  It is native to Europe and western Asia and introduced widely in North America. Mussaenda villosa is a species of flowering shrub in the Rubiaceae family.  It has orange petals and white bracts. Mussaenda is a genus of flowering plants in the Rubiaceae family.  They are native to the African and Asian tropics and subtropics.  Several species are cultivated as ornamental plants.  It contains some 194 species, including: Sanguinaria canadensis (bloodroot) is a perennial, herbaceous flowering plant native to eastern North America.  It is the only species in the genus Sanguinaria, included in the family Papaveraceae, and most closely related to "Eomecon" of eastern Asia. North American Atlantic Region is a floristic region within the Holarctic Kingdom identified by Armen Takhtajan and Robert F. Thorne, spanning from the Atlantic and Gulf coasts to the Great Plains and comprising a major part of the United States and southeastern portions of Canada.  It is bordered by the Circumboreal floristic region in the north, by the Rocky Mountain and Madrean floristic regions in the west and by the Caribbean floristic region of the Neotropical Kingdom in the south of Florida.  The flora of the region comprises two endemic monotypic families, Hydrastidaceae and Leitneriaceae, and is characterized by about a hundred of endemic genera (such as "Sanguinaria", "Leavenworthia", "Gillenia", "Neviusia", "Dionaea", "Yeatesia", "Pleea").  The degree of species endemism is very high, many species are Tertiary relicts, which survived the Wisconsin glaciation and are now concentrated in the Appalachians (esp.  Blue Ridge Mountains) and the Ozarks.  A number of genera ("Sarracenia", "Uvularia" etc.) are shared only with the Canadian floristic province of the Circumboreal region.  Moreover, as has long been noted (e.g. by Joseph Gerhard Zuccarini and especially by Asa Gray), a large number of relict genera ("Liriodendron", "Hamamelis", "Stewartia" etc.) are shared with the relatively distant Eastern Asiatic Region (comprising Japan and the east of China) and sometimes Southeast Asia.  R. F. Thorne counted at least 74 genera restricted to eastern North America and Asia (mostly eastern and southeastern Asia).  The fossil record indicates that during the Tertiary period a warm temperate zone extended across much of the Northern Hemisphere, linking America to Asia. Mussaenda frondosa, the wild mussaenda or dhobi tree, is a plant of Rubiaceae family.  It is a smaller shrub 1.5-2 m tall by 1.5-2 m wide.  Like all other "Mussaenda" species, petals are visible as well as white leaves just below the flower.  Usually they arose with fruits.  Known as ""Wal buthsarana (වල් බුත්සරන)"" in Sinhala language.
Answer: Mussaenda