Question: Which is a genus native to more areas of the world, Ailanthus or Leonotis? 
Context: Peristoreus is a weevil genus native to New Zealand.  This genus was first described in 1877 by Theodor Franz Wilhelm Kirsch. Leonotis artemisia, also known as motherwort, is a species of plant in the Leonotis genus and the Lamiaceae (mint) family.  It is native to Asia. Glyceria maxima (Hartm.)  Holmb.  (syn.  "G. aquatica" (L.) Wahlenb.; "G. spectabilis" Mert.  & W.D.J. Koch; "Molinia maxima" Hartm.; "Poa aquatica" L.), commonly known as Great Manna Grass, Reed Mannagrass, and Reed Sweet-grass, is a species of rhizomatous perennial grasses in the mannagrass genus native to Europe and Western Siberia and growing in wet areas such as riverbanks and ponds.  It is highly competitive and invasive and is often considered to be a noxious weed outside its native range. Ailanthus ( ; derived from "ailanto," an Ambonese word probably meaning "tree of the gods" or "tree of heaven") is a genus of trees belonging to the family Simaroubaceae, in the order Sapindales (formerly Rutales or Geraniales).  The genus is native from east Asia south to northern Australasia. Phrynium is a plant genus native to China, India, Southeast Asia, New Guinea and Melanesia.  It was described as a genus in 1797. Hypatima is a genus of the twirler moth family (Gelechiidae).  Among these, it belongs to a distinct lineage, which is variously treated as tribe Chelariini in subfamilies Dichomeridinae (like done here), Gelechiinae, or even Pexicopiinae, and historically was considered a subfamily in its own right, Chelariinae.  Of this lineage, "Hypatima" – under its junior synonym "Chelaria" – is the type genus.  This genus has numerous species, but its exact limits are not quite clear (see below).  This genus occurs mainly in the Southern Hemisphere, though one of the better-known species is the only member of this genus native to Europe, the lobster-clawed moth ("H. rhomboidella"). Leonotis is a genus of flowering plants in the family Lamiaceae.  One species, "Leonotis nepetifolia", is native to tropical Africa and southern India.  It is naturalized throughout most of the tropics.  The other species are endemic to southern + eastern Africa. Leonotis nepetifolia, also known as klip dagga, Christmas candlestick, or lion's ear, is a species of plant in the genus "Leonotis" and the family Lamiaceae (mint).  It is native to tropical Africa and southern India.  It can also be found growing abundantly in much of Latin America and the West Indies.  It grows to a height of 3 m and has whorls of striking lipped flowers, that are most commonly orange, but can vary to red, white, and purple.  It has very soft serrated leaves that can grow up to 4 in wide. Lygodium palmatum is the only species of its genus native to North America.  Unlike most species in the genus, this one, called the American climbing fern (or Hartford fern, after Hartford, Connecticut), is extremely hardy in temperate zones. Ailanthus altissima , commonly known as tree of heaven, ailanthus, or in Standard Chinese as chouchun (), is a deciduous tree in the Simaroubaceae family.  It is native to both northeast and central China, as well as Taiwan.  Unlike other members of the genus "Ailanthus", it is found in temperate climates rather than the tropics.  The tree grows rapidly and is capable of reaching heights of 15 m in 25 years.  However, the species is also short lived and rarely lives more than 50 years, though its remarkable suckering ability makes it possible for this tree to clone itself indefinitely and live considerably longer (since they are linked to the mother tree and thus partly fed by it, the suckers are less vulnerable than the seedlings and can grow faster).
Answer: Leonotis