Austrocedrus is a genus of conifer belonging to the cypress family Cupressaceae.
 It has only one species, Austrocedrus chilensis, native to the Valdivian temperate rain forests and the adjacent drier steppe-forests of central-southern Chile and western Argentina from 33°S to 44°S latitude.
 It is known in its native area as ciprés de la cordillera or cordilleran cypress, and elsewhere by the scientific name as Austrocedrus, or sometimes as Chilean incense-cedar or Chilean cedar.
 The generic name means "southern cedar".
Ceiba pentandra is a tropical tree of the order Malvales and the family Malvaceae (previously separated in the family Bombacaceae), native to Mexico, Central America and the Caribbean, northern South America, and (as the variety "C. pentandra" var.
 "guineensis") to tropical west Africa.
 A somewhat smaller variety is found throughout southern Asia and the East Indies.
 Kapok is the most used common name for the tree and may also refer to the cotton-like fluff obtained from its seed pods.
 The tree is cultivated for the seed fibre, particularly in south-east Asia, and is also known as the Java cotton, Java kapok, silk-cotton, Samauma, or ceiba.
Cavanillesia is a genus of trees in the Malvaceae family.
 It is native to Panama and South America.
Sterculioideae is a subfamily of the Malvaceae family containing evergreen and deciduous trees and shrubs.
Ceiba is a genus of trees in the Malvaceace family, native to tropical and subtropical areas of the Americas (from Mexico and the Caribbean to N Argentina) and tropical West Africa.
 Some species can grow to 70 m tall or more, with a straight, largely branchless trunk that culminates in a huge, spreading canopy, and buttress roots that can be taller than a grown person.
 The best-known, and most widely cultivated, species is Kapok, "Ceiba pentandra", one of several trees called kapok.
Luehea is a genus of trees in the Malvaceae family.
Cavanillesia umbellata is a species of trees in the Malvaceae family.
 It is native to South America.
Spirotheca is a genus of trees in the Malvaceae family, native to Central and South America.
Maxwellia lepidota is a species of shrubs or trees in the Malvaceae family.
 It is endemic to New Caledonia and the only species of the genus Maxwellia.
 Its closest relatives are all Australian genera in tribe Lasiopetaleae: "Guichenotia", "Hannafordia", "Lysiosepalum", "Lasiopetalum" and "Thomasia".
Patinoa is a genus of trees in the Malvaceae family, native to Panama and South America.

Question: Which is a genus of trees in the Malvaceae family,  Ceiba or Austrocedrus?
Answer: Ceiba