Question: Which genus of plants is found in more continents, Phytolacca or Symplocos?
Context: The common name glasswort came into use in the 16th century to describe plants growing in England whose ashes could be used for making soda-based (as opposed to potash-based) glass.  The glassworts are succulent, annual halophytes, or plants that thrive in saline environments, such as seacoasts and salt marshes.  While the original English glasswort plants belong to the genus "Salicornia", the term has been extended over the years to halophyte plants from several genera, some of which are native to continents unknown to the medieval English, and growing in ecosystems, such as mangrove swamps, never envisioned when the term glasswort was coined. Symplocos is a genus of flowering plants in the order Ericales.  It contains about 300 species distributed in Asia and the Americas.  Many species grow in humid tropical regions.  This is sometimes considered to be the only genus in family Symplocaceae.  Plants in this family are shrubs and trees with white or yellow flowers. Potentilla is a genus containing over 300 species of annual, biennial and perennial herbaceous flowering plants in the rose family, Rosaceae.  They are usually called cinquefoils in English.  "Potentilla" are generally only found throughout the northern continents of the world (holarctic), though some may even be found in montane biomes of the New Guinea Highlands.  Several other "cinquefoils" formerly included here are now separated in distinct genera. Bracken ("Pteridium") is a genus of large, coarse ferns in the family Dennstaedtiaceae.  Ferns (Pteridophyta) are vascular plants that have alternating generations, large plants that produce spores and small plants that produce sex cells (eggs and sperm).  Brackens are noted for their large, highly divided leaves.  They are found on all continents except Antarctica and in all environments except deserts, though their typical habitat is moorland.  The genus probably has the widest distribution of any fern in the world. 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". Piriformospora is a fungal genus of the order Sebacinales.  It is a monotypic genus, containing the single endophytic root-colonising species Piriformospora indica, discovered from orchid plants in the Thar desert in Rajasthan, India by Prof. Ajit Verma and group, School of Life Sciences, Jawaharlal Nehru University, New Delhi.  The fungus has typical pear-shaped chlamydospores, and thus, named as "P. indica ".  Unlike mycorrhizal fungi, which cannot be cultured axenically, "P. indica" can be easily grown on various substrates.  It has been found to promote plant growth during its mutualistic symbiotic relationship with a wide variety of plants.  Experiments have shown that "P. indica" increases the resistance of colonized plants against fungal pathogens.  It has also been found in experiments with barley that "P. indica"-inoculated plants are tolerant to salt stress and more resistant to root pathogens.  "P. indica"-infested roots also show antioxidant capacity.  The fungus also induces systemic disease resistance in plants.  "P. indica" was found to require host cell death for proliferation during mutualistic symbiosis in barley.  Its genome has been sequenced and was published in 2011. Phytolacca is a genus of perennial plants native to North America, South America, East Asia and New Zealand.  Some members of the genus are known as pokeweeds or similar names such as pokebush, pokeberry, pokeroot or poke sallet.  Other names for species of "Phytolacca" include inkberry and ombú.  The generic name is derived from the Greek word φυτόν ("phyton"), meaning "plant," and the Latin word "lacca", a red dye.  Phytolaccatoxin and phytolaccigenin are present in many species which are poisonous to mammals if not cooked properly.  However, the berries are eaten by birds, which are not affected by the toxin because the small seeds with very hard outer shells remain intact in the digestive system and are eliminated whole. Wolffia is a genus of nine to 11 species which include the smallest flowering plants on Earth.  Commonly called watermeal or duckweed, these aquatic plants resemble specks of cornmeal floating on the water.  "Wolffia" species are free-floating thalli, green or yellow-green, and without roots.  The flower is produced in a depression on the top surface of the plant body.  It has one stamen and one pistil.  Individuals often float together in pairs or form floating mats with related plants, such as "Lemna" and "Spirodela" species.  Most species have a very wide distribution across several continents.  "Wolffia" species are composed of about 40% protein on a dry-matter basis, about the same as the soybean, making them a potential high-protein human food source.  They have historically been collected from the water and eaten as a vegetable in much of Asia.  The genus was first recorded in New Zealand by Ruth Mason. Many plants are poisonous to equines; the species vary depending on location, climate, and grazing conditions.  In many cases, entire genera are poisonous to equines and include many species spread over several continents.  Plants can cause reactions ranging from laminitis (found in horses bedded on shavings from black walnut trees), anemia, kidney disease and kidney failure (from eating the wilted leaves of red maples), to cyanide poisoning (from the ingestion of plant matter from members of the "Prunus" genus) and other symptoms.  Members of the "Prunus" genus have also been theorized to be at fault for mare reproductive loss syndrome.  Some plants, including yews, are deadly and extremely fast-acting.  Several plants, including nightshade, become more toxic as they wilt and die, posing a danger to horses eating dried hay or plant matter blown into their pastures. 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.
Answer: Phytolacca