Question: Which genus can be found on the most continents, Hechtia or Zantedeschia?

Context paragraphs:
Epicauta: Epicauta is a genus of beetles in the blister beetle family, Meloidae.  The genus was first scientifically described in 1834 by Pierre François Marie Auguste Dejean.  "Epicauta" is distributed nearly worldwide, with species native to all continents except Australia.  Surveys have found the genus to be particularly diverse in northern Arizona in the United States.  Few species occur in the Arctic, with none farther north than the southern Northwest Territory of Canada.

Coleophora: Coleophora is a very large genus of moths of the family Coleophoridae.  It contains some 1,350 described species.  The genus is represented on all continents, but the majority are found in the Nearctic and Palaearctic regions.  Many authors have tried splitting the genus into numerous smaller ones, but most of these have not become widely accepted.

Hypolimnas: Hypolimnas is a genus of tropical brush-footed butterflies commonly known as eggflies or diadems.  The genus contains approximately 23 species, most of which are found in Africa, Asia, and Oceania.  One species, the Danaid eggfly ("H. misippus"), is noted for its exceptionally wide distribution across five continents; it is the only "Hypolimnas" species found in the Americas.

Hechtia: Hechtia is a genus of the botanical family Bromeliaceae, subfamily Pitcairnioideae.  Its species are native to Mexico, Central America, and Texas.

Zantedeschia: Zantedeschia is a genus of 8 species of herbaceous, perennial, flowering plants in the family Araceae, native to southern Africa from South Africa north to Malawi.  The genus has been introduced on all continents except Antarctica.  Common names include arum lily for "Z. aethiopica" and calla and calla lily for "Z. elliottiana" and "Z. rehmannii", although members of the genus are neither true lilies of Liliaceae, true "Arums", or true "Callas" (related genera in Araceae).  They are also often confused with "Anthurium".  The colourful flowers and leaves of both species and cultivars are greatly valued and commonly grown as ornamental plants.

Rhytachne: Rhytachne is a genus of plants in the grass family.  They grow principally in wet savannahs in Africa and the Americas.  More specifically, they tend to prefer transitional zones between marshes and drier upland savannahs.  In the Americas the genus can be found from southern Mexico and Cuba south to northern Argentina, while in Africa it is present below the Sahara, including in Madagascar.  Twelve species are included, of which nine are African, two are American, and one, "Rhytachne subgibbosa", is found on both continents.  The genus is closely related to "Coelorachis".

List of Coleophora species: This is a list of all Coleophora species. " Coleophora" is a very large genus of moths of the family Coleophoridae.  It contains some 1,350 described species.  The genus is represented on all continents, but the majority are found in the Nearctic and Palaearctic regions.  Many authors have tried splitting the genus into numerous smaller ones, but most of these have not become widely accepted.

Ptychodus: Ptychodus is a genus of extinct hybodontiform sharks.  As well as a genus of durophagous (shell-crushing) sharks from the Late Cretaceous.  Fossils of "Ptychodus" teeth are found in plenty in many of the Late Cretaceous marine sediments.  There are many species among the "Ptychodus" that have been uncovered on all the continents around the globe.  Such species are "Ptychodus mortoni", "P. decurrens", "P. marginalis", "P. mammillaris", "P. rugosus" and "P. latissimus" to name a few.  They died out approximately 85 million years ago in the Western Interior Sea, where a majority of them were found.

Vespinae: The subfamily Vespinae contains the largest and best-known eusocial wasps, including true hornets (the genus "Vespa"), and the "yellowjackets" (genera "Dolichovespula" and "Vespula").  The remaining genus, "Provespa", is a small, poorly known group of nocturnal wasps from Southeast Asia.  One genus, "Palaeovespa", has been described from the Eocene fossil record, from Colorado.  Collectively, the group can be found on all continents except Antarctica, and several of these wasps are invasive species, introduced beyond their native ranges, and can be major pests.

Aedes: Aedes is a genus of mosquitoes originally found in tropical and subtropical zones, but now found on all continents except Antarctica.  Some species have been spread by human activity. " Aedes albopictus", a most invasive species, was recently spread to the New World, including the United States, by the used-tire trade.  First described and named by German entomologist Johann Wilhelm Meigen in 1818, the generic name comes from the Ancient Greek ἀηδής, "aēdēs", meaning "unpleasant" or "odious".  The type species for "Aedes" is "Aedes cinereus".  Some species of this genus transmit serious diseases, including dengue fever, yellow fever, the Zika virus, and chikungunya.  In Polynesia, the species "Aedes polynesiensis" is responsible for the transmission of human lymphatic filariasis.

Supporting paragraphs: Hechtia Zantedeschia
Answer: Zantedeschia