Question: Which plant has a larger area of distribution, Dryopteris or Calpurnia?
Context: Dryopteris cristata is a species of fern native to wetlands throughout the Northern Hemisphere.  It is known as crested wood fern or crested buckler-fern.  This plant is a tetraploid species of hybrid origin, one parent being "Dryopteris ludoviciana" and the other being the unknown, apparently extinct species, dubbed "Dryopteris semicristata", which is also one of the presumed parents of "Dryopteris carthusiana".  "D. cristata" in turn is one of the parents of "Dryopteris clintoniana", another fern of hybrid origin. Dryopteris , commonly called wood fern, male fern (referring in particular to "Dryopteris filix-mas"), or buckler fern, is a genus of about 250 species of ferns with distribution in Eastern Asia, the Americas, Europe, Africa, and the Pacific islands, with the highest species diversity in eastern Asia.  Many of the species have stout, slowly creeping rootstocks that form a crown, with a vase-like ring of fronds.  The sori are round, with a peltate indusium.  The stipes have prominent scales. The nuclear cross section of a nucleus is used to characterize the probability that a nuclear reaction will occur.  The concept of a nuclear cross section can be quantified physically in terms of "characteristic area" where a larger area means a larger probability of interaction.  The standard unit for measuring a nuclear cross section (denoted as σ) is the barn, which is equal to 10 m² or 10 cm².  Cross sections can be measured for all possible interaction processes together, in which case they are called total cross sections, or for specific processes, distinguishing elastic scattering and inelastic scattering; of the latter, amongst neutron cross sections the absorption cross sections are of particular interest. Dryopteris goldiana, commonly called Goldie's wood fern, or giant wood fern is a fern native to the eastern United States and adjacent areas of Canada, from New Brunswick to Ontario and Georgia.  It is the largest native North American species of "Dryopteris" and along with ostrich fern it is one of the largest ferns in eastern North America.  Specimens are known with fronds six feet (1.8 meters) tall.  "D. goldiana" hybridizes with many other species of "Dryopteris" and the hybrids tend to be larger than the pure species.  It was named by William Hooker in honor of its discoverer, John Goldie. The City of Bradford ( ) is a local government district of West Yorkshire, England, with the status of a city and metropolitan borough.  It is named after its largest settlement, Bradford, but covers a far larger area which includes the towns of Keighley, Shipley, Bingley, Ilkley, Haworth, Silsden and Denholme.  Bradford has a population of 528,155, making it the fourth-most populous metropolitan district and the sixth-most populous local authority district in England.  It forms part of the West Yorkshire Urban Area conurbation which in 2001 had a population of 1.5 million and the city is part of the Leeds-Bradford Larger Urban Zone (LUZ), which, with a population of 2,393,300, is the fourth largest in the United Kingdom after London, Birmingham and Manchester. The Upper Beaches is a rather recently coined name for the neighbourhood directly north of the Beaches area in Toronto, Ontario, Canada.  It stretches from Coxwell Avenue in the west to Victoria Park in the east.  The southern border is Kingston Road, while the northern boundary is generally considered to be the Canadian National Railway tracks between Gerrard Street and Danforth Avenue.  The western part of the area was originally called Norway, and the larger area was once part of the Town of East Toronto.  The name "Upper Beaches" was first used by developers and real estate agents around the period of 2001 to 2003 for the selling of houses on redeveloped land in the area, and was used as a marketing tag to attract buyers.  The area was never considered part of the Beaches neighborhood, but was close to it.  The city's current name for this area is East End Danforth, though that is rarely used.  The city also includes the buildings along and just north of Danforth Avenue in the neighbourhood.  The western portion between Woodbine Avenue and Coxwell is referred to by the city as Woodbine Corridor. Calpurnia is a genus of flowering plants within the family Fabaceae.  The genus comprises shrubs or small trees in or along the margin of forests in the eastern parts of South Africa.  They shed leaves in winter unless in moist areas, where they are evergreen.  They make good garden plants because they are easily raised from seed, flower at two years and withstand frost. The Stockholm urban area (Swedish: "Stockholms tätort" ) is the largest and most populous of the statistical localities or urban areas in Sweden.  It has no administrative function of its own, but constitutes a continuous built-up area, which extends into 11 municipalities in Stockholm County.  It contains the municipal seats of 10 of those.  As of 31 December 2010, the population in the Stockholm urban area was 1,372,565 inhabitants, the area 381.63 km2 , and the population density 3,597 inh/km².  Stockholm urban area is not the same as Metropolitan Stockholm ("Storstockholm" ), which is a much larger area. The index of dissimilarity is a demographic measure of the evenness with which two groups are distributed across component geographic areas that make up a larger area.  The index score can also be interpreted as the percentage of one of the two groups included in the calculation that would have to move to different geographic areas in order to produce a distribution that matches that of the larger area.  The index of dissimilarity can be used as a measure of segregation. Hisehope Burn Valley is a Site of Special Scientific Interest in the Derwentside district of Durham, England.  It consists of two separate parcels of land, one on the west bank of Hisehope Burn, the other (and larger) a few hundred yards to the east, straddling the headwaters of another small burn.  The site is some 3 km west of the village of Castleside and 1 km north of the Smiddy Shaw Reservoir.  The larger area adjoins the Muggleswick, Stanhope and Edmundbyers Commons and Blanchland Moor SSSI.
Answer: Dryopteris