Question: Which Genus has four species, Duboisia or Ctenanthe?
Context: Ctenanthe is a genus of flowering plants of the family Marantaceae described as a genus in 1884.  They are evergreen perennials, native to Central and South America (primarily Brazil).  They are grown for their attractive, often variegated foliage.  They are frost tender, requiring a minimum temperature of 13 C . The crimsonwings (Cryptospiza) are a genus of small passerine birds belonging to the estrildid finch family (Estrildidae).  There are four species.  They are found in parts of Sub-Saharan Africa, particularly the Albertine Rift; all four species occur there and two, Shelley's and dusky crimsonwings, are found nowhere else.  They are secretive birds which mainly inhabit mountain forests with dense undergrowth.  They usually forage on or near the ground, feeding mainly on seeds such as those of grasses and balsam. Haploblepharus is a genus of catshark, and part of the family Scyliorhinidae, containing four species of shysharks.  Their common name comes from a distinctive defensive behavior in which the shark curls into a circle and covers its eyes with its tail.  The genus is endemic to southern Africa, inhabiting shallow coastal waters.  All four species are small, stout-bodied sharks with broad, flattened heads and rounded snouts.  They are characterized by very large nostrils with enlarged, triangular flaps of skin that reach the mouth, and deep grooves between the nostrils and the mouth.  Shysharks are bottom-dwelling predators of bony fishes and invertebrates.  They are oviparous, with the females laying egg capsules.  These harmless sharks are of no commercial or recreational interest, though their highly limited distributions in heavily fished South African waters are of potential conservation concern. Neohelos is an extinct diprotodontid marsupial, that lived from the early to middle-Miocene.  There are four species assigned to this genus, N. tirarensis, the type species, N. stirtoni, N. solus and N. davidridei.  "N. davidridei" is the most derived species of the genus, and its premolar morphology shows that it is structurally and ancestor of the genus "Kolopsis".  All four species are from the Bullock Creek in the Northern Territory and Riversleigh of Australia. Scylla is a genus of swimming crabs, comprising four species, of which "S. serrata" is the most widespread.  They are found across the Indo-West Pacific.  The four species are: Phragmites is a genus of four species of large perennial grasses found in wetlands throughout temperate and tropical regions of the world.  The World Checklist of Selected Plant Families, maintained by Kew Garden in London, accepts the following four species: Squawfish or pikeminnows are cyprinid fish of the genus Ptychocheilus consisting of four species native to western North America.  Voracious predators, they are considered an "undesirable" species in many waters.  This is largely due to the species' perceived tendency to prey upon small trout and salmon.  First known in western science by the common name Columbia River Dace, the four species all became lumped under the offensive name "squawfish."  In 1999, the American Fisheries Society adopted "pikeminnow" as the name it recommends, because Native Americans considered "squawfish" offensive. Four species of monkey are native to the forests of Costa Rica, the Central American squirrel monkey ("Saimiri oerstedii"), the white-headed capuchin ("Cebus capucinus"), the mantled howler ("Alouatta palliata") and Geoffroy's spider monkey ("Ateles geoffroyi").  All four species are classified scientifically as New World Monkeys. Two of the species, the Central American squirrel monkey and the white-headed capuchin, belong to the family Cebidae, the family containing the squirrel monkeys and capuchins.  The other two species belong to the family Atelidae, the family containing the howler monkeys, spider monkeys, woolly monkeys and muriquis. Each of the four species can be seen in national parks within Costa Rica, where viewing them in natural surroundings is a popular tourist attraction.  The only park in which all four species can be seen is Corcovado National Park, on the Osa Peninsula. Duboisia (commonly called corkwood tree) is a genus of small perennial shrubs and trees up to 14 metres (46 feet) tall, with extremely light wood and a thick corky bark.  There are four species; all occur in Australia, and one also occurs in New Caledonia. The genus Taricha consists of four species of newts in the family Salamandridae.  Their common name is Pacific newts, sometimes also western newts or roughskin newts.  The four species within this genus are the California newt, the rough-skinned newt, the red-bellied newt, and the sierra newt, all of which are found on the Pacific coastal region from southern Alaska to southern California, with one species possibly ranging into northern Baja California, Mexico.
Answer: Duboisia