Question: Which plant was classified as a Eucalyptus until the mid 90s, the Physocarpus or Corymbia?
Context: Corymbia eximia, commonly known as the yellow bloodwood, is a bloodwood native to New South Wales.  It occurs around the Sydney Basin often in high rainfall areas on shallow sandstone soils on plateaux or escarpments, in fire prone areas.  Growing as a gnarled tree to 20 m , it is recognisable by its distinctive yellow-brown tessellated bark.  The greyish green leaves are thick and veiny, and lanceolate spear- or sickle-shaped.  The cream flowerheads grow in panicles in groups of seven and appear in spring.  Known for many years as "Eucalyptus eximia", the yellow bloodwood was transferred into the new genus "Corymbia" in 1995 when it was erected by Ken Hill and Lawrie Johnson.  It is still seen under the earlier name in some works. Corymbia ficifolia, commonly known as the red flowering gum, Albany red flowering gum and the Albany redgum, (previously known as "Eucalyptus ficifolia") is one of the most commonly planted ornamental trees in the broader eucalyptus family. Corymbia haematoxylon, formerly known as Eucalyptus haematoxylon, is a species of eucalypt native to southwestern Australia.  It was given its current name in 1995 with the creation of the genus "Corymbia".  It is commonly called the mountain marri. Corymbia ptychocarpa, commonly known as the swamp bloodwood or the pink-flowering bloodwood and formerly known as Eucalyptus ptychocarpa, is a species of eucalypt native to northwestern Australia.  It was given its current name in 1995 with the creation of the genus "Corymbia". Ernst Georg Åberg (1823–1907) was a Swedish physician.  Born in Stockholm, Sweden in 1823, he wrote a doctoral thesis at Uppsala University in 1850 on the subject of chronic arsenic poisoning.  He practiced as a doctor in Stockholm initially, but having contracted tuberculosis, around 1855 he emigrated to Argentina in search of a warmer climate.  He continued to practice in Argentina, founded a gymnastics institute, and was consulted on sanitary problems by the Argentinian government on a number of occasions.  He also developed an interest in the establishment of "Eucalyptus" in the La Plata Partido, prompting Ferdinand von Mueller to name "Eucalyptus abergiana" (now "Corymbia abergiana") in his honour in 1878.  He returned to Stockholm around 1877, later moved to Switzerland, and returned to Buenos Aires in the late 1890s.  He died there in 1907. Eucalyptus oil is the generic name for distilled oil from the leaf of "Eucalyptus", a genus of the plant family Myrtaceae native to Australia and cultivated worldwide.  Eucalyptus oil has a history of wide application, as a pharmaceutical, antiseptic, repellent, flavouring, fragrance and industrial uses.  The leaves of selected "Eucalyptus" species are steam distilled to extract eucalyptus oil. Physocarpus, commonly called ninebark, is a genus of flowering plants in the family Rosaceae, native to North America (most species) and northeastern Asia (one species). Eucalyptus L'Héritier 1789 is a diverse genus of flowering trees and shrubs (including a distinct group with a multiple-stem mallee growth habit) in the myrtle family, Myrtaceae.  Members of the genus dominate the tree flora of Australia, and include "Eucalyptus regnans", the tallest known flowering plant on Earth.  There are more than 700 species of eucalyptus and most are native to Australia; a very small number are found in adjacent areas of New Guinea and Indonesia.  One species, "Eucalyptus deglupta," ranges as far north as the Philippines.  Of the 15 species found outside Australia, just nine are exclusively non-Australian.  Species of eucalyptus are cultivated widely in the tropical and temperate world, including the Americas, Europe, Africa, the Mediterranean Basin, the Middle East, China, and the Indian subcontinent.  However, the range over which many eucalypts can be planted in the temperate zone is constrained by their limited cold tolerance.  Australia is covered by 92000000 ha of eucalypt forest, comprising three quarters of the area covered by native forest. Corymbia is a genus of about 113 species of tree that were classified as "Eucalyptus" species until the mid-1990s.  It includes the bloodwoods, ghost gums and spotted gums.  The bloodwoods had been recognised as a distinct group within the large and diverse "Eucalyptus" genus since 1867.  Molecular research in the 1990s, however, showed that they, along with the rest of the Corymbia section, are more closely related to "Angophora" than to "Eucalyptus", and are probably best regarded as a separate genus.  All three genera—"Angophora", "Corymbia" and "Eucalyptus"—are closely related, often difficult to tell apart, and are still commonly and correctly referred to as "eucalypts".  Groups of naturalists and conservationists do not recognise the "Corymbia" genus and still categorise its species within "Eucalyptus". Epichrysocharis burwelli, the lemon scent eucalyptus gall wasp, is a species of gall wasp from the family Eulophidae which was first described from California in 2000 but which is thought to have originated in Australia, where its host plant is indigenous.  It is now found in many areas of the World where its host plant, the lemon-scented eucalyptus "Corymbia citriodora" is grown.
Answer: Corymbia