Carissa tetramera grows as a shrub up to 3 m tall.
 Its strong-scented flowers feature a white corolla, often tinged pink.
 Fruit is red to purple-black when ripe.
 Habitat is dry open woodland.
 Vernacular names for the plant include "sand num-num".
 "C. tetramera" is native to Kenya, Tanzania, Zimbabwe, Mozambique, Swaziland and South Africa.
Carissa spinarum, the conkerberry or bush plum, is a large shrub of the dogbane family (Apocynaceae), widely distributed in tropical regions of Africa, Southern Asia, Australia, and various islands of the Indian Ocean.
 It is most well known in Australia, where it is also called "currant bush" or, more ambiguously, "native currant" or even "black currant".
 It is, however, neither closely related to plums ("Prunus") nor to true currants ("Ribes"), which belong to entirely different lineages of eudicots.
 In India, it is also called wild karanda /wild karavanda, referring to the related karanda ("C. carandas").
 "Carissa spinarum" is often discussed under its many obsolete synonyms (see below).
Ponapea is a genus of palms which is native to certain islands in the western Pacific.
 The genus consists of four species, and has often been considered to be part of the genus "Ptychosperma".
 Three of the species are endemic to the Caroline Islands, the fourth to the Bismarck Archipelago.
Archontophoenix alexandrae (Alexander palm, Alexandra palm, King Alexander palm, King palm, Northern bangalow palm; syn.
 "Ptychosperma alexandrae" F.Muell.)
 is a palm native to Queensland and New South Wales, Australia, and naturalised in Hawaii.
Balaka is a genus of 9 known species in the palm family, Arecaceae or Palmae.
 Seven species are native to the islands of Fiji and two to Samoa.
 The genus was first proposed and published in "Annales du Jardin Botanique de Buitenzorg" 2: 91.
 1885, from two species originally in the genus "Ptychosperma" ("P. perbrevis" and "P. seemannii").
Carissa macrocarpa is a shrub native to South Africa.
 It is commonly known as the Natal plum and, in South Africa, the large num-num.
 In Zulu, as well as in the Bantu tribes of Uganda, it is called Amathungulu or umThungulu oBomvu.
 In Afrikaans the fruit is called noem-noem.
Carissa bispinosa grows as a shrub or small tree up to 5 m tall.
 Its fragrant flowers feature a white corolla.
 Fruit is red when ripe.
 Habitat is woodland and forest from 1080 m to 1630 m altitude.
 Vernacular names for the plant include "forest num-num" and "Y-thorned carissa".
 "C. bispinosa" is native to Malawi, Zimbabwe, Mozambique, Swaziland and South Africa.
Carissa is a genus of shrubs or small trees native to tropical and subtropical regions of Africa, Australia and Asia.
 Until recently about 100 species were listed, but most of them have been relegated to the status of synonyms or assigned to other genera, such as "Acokanthera".
Ptychosperma is a genus of flowering plant in the Arecaceae family.
 Most are native to Australia and/or New Guinea, with a few in the Solomon Islands and in Maluku Province of eastern Indonesia.
 Some have been cultivated abroad as house or garden plants, and reportedly naturalized in certain regions (Caribbean, Polynesia, Fiji, Florida).

Question: Ptychosperma and Carissa are both native to where?
Answer: Australia