Question: Which of these is in the African violet family, Maclura or Petrocosmea?

Context paragraphs:
Negria: Negria is a plant genus in the Gesneriaceae, or African Violet family.  Its only species is Negria rhabdothamnoides, commonly known as the pumpkin tree, which is endemic to Australia’s subtropical Lord Howe Island in the Tasman Sea.  It is related to "Lenbrassia" and "Depanthus".

Primulina: Primulina is a genus of the family Gesneriaceae, the African violet family.  In 2011 the genus was expanded with the transfer of many species that had previously been place in the genus "Chirita".  In 2016, five species were moved to the genus "Deinostigma".

Streptocarpus rexii: Streptocarpus rexii is a South African plant in the "Gloxinia" and African Violet family of Gesneriaceae, and occurring widely from the southern Cape along the coastal hills, mountains, wooded ravines and valleys, and moist forests of the east coast, through Natal as far north as the Eastern Transvaal, up to an altitude of about 900 m.  This genus of epiphytes and lithophytes, of about 130 species, is mainly African and Mascarene, with four vagrant species in Asia.  "Streptocarpus", as do other Old World Gesneriaceae, is unusual in that it displays anisocotylous or unequal growth, i.e. one cotyledon continues to grow after germination.

Cyrtandra giffardii: Cyrtandra giffardii is a rare species of flowering plant in the African violet family known by the common names forest cyrtandra and Giffard's cyrtandra.  It is endemic to the island of Hawaii, where it grows on the slopes of Mauna Kea and Mauna Loa.  A 1998 estimate places the total remaining population size around 1000 individual plants.  It is a tree which grows 2 to 6 meters tall and bears white flowers.  It was federally listed as an endangered species in 1994.  Like other Hawaiian "Cyrtandra" it is called ha`iwale.

Petrocosmea: Petrocosmea is a genus of the family Gesneriaceae, the African violet family.  Most of the species within this genus are endemic to high-altitude areas in Western China, although some are native to other parts of Asia.  It is a rosette forming genus that generally grows on wet mossy rocks or forests.

Cyrtandra dentata: Cyrtandra dentata is a rare species of flowering plant in the African violet family known by the common names mountain cyrtandra and sharp-toothed cyrtandra.  It is endemic to Oahu in Hawaii, where the most recent count estimates 1640 plants occurring in the Waianae Mountains and Koʻolau Mountains.  It is a shrub which can reach 5 meters tall and bears white flowers.  It was federally listed as an endangered species in 1996.  Like other Hawaiian "Cyrtandra" it is called ha`iwale.

Cyrtandra crenata: Cyrtandra crenata is a rare species of flowering plant in the African violet family known by the common name Kahana Valley cyrtandra.  It is endemic to Oahu in Hawaii, where it is known only from the Koolau Mountains.  It has not been seen since 1947, however, and it is feared extinct.  The habitat is steep and inaccessible in some areas, so it is possible that specimens of this species still exist in the wild.  It was federally listed an endangered species of the United States in 1994.  This shrub grows 1 to 2 meters tall and bears white flowers.  Like other Hawaiian "Cyrtandra" it is called ha`iwale.

African Violet Society of America: The African Violet Society of America is an international society of plant enthusiasts who promote the cultivation of African violets ("Saintpaulia" species and cultivars) as house plants.  The Society hosts an annual convention and publishes a bi-monthly full-color 64-page magazine, the "African Violet Magazine".

Cyrtandra cyaneoides: Cyrtandra cyaneoides is a rare species of flowering plant in the African violet family known by the common name mapele.  It is endemic to Kauai in Hawaii, where it is known from eleven populations containing a total of under 800 individual plants.  Several of these were discovered between 2003 and 2008.  It is a shrub growing 1 to 1.3 meters tall and bearing white flowers.  It was federally listed as an endangered species in 1996.

Maclura: Maclura is a genus of flowering plants in the mulberry family, Moraceae.  It includes the inedible Osage orange, which is used as mosquito repellent and grown throughout the United States as a hedging plant.

Supporting paragraphs: Petrocosmea Maclura
Answer: Petrocosmea