Are both Boronia and Escobaria native to the same continent?
no
Escobaria
Escobaria, pincushion cactus or foxtail cactus is a genus of low-growing cacti that range from the southernmost parts of central and western Canada through northern Mexico, with one species in Cuba.
 The genus comprises about 23 species.
 The term "pincushion cactus" may also refer to the related "Mammillaria".
Boronia
Boronia is a genus of about 160 species of flowering plants in the citrus family Rutaceae, most are endemic in Australia with a few species in New Caledonia, which were previously placed in the genus "Boronella".
 They occur in all Australian states but the genus is under review and a number of species are yet to be described or the description published.
 Boronias are similar to familiar plants in the genera "Zieria", "Eriostemon" and "Correa" but can be distinguished from them by the number of petals or stamens.
 Some species have a distinctive fragrance and are popular garden plants.
Mammillaria
The genus Mammillaria is one of the largest in the cactus family (Cactaceae), with currently 200 known species and varieties recognized.
 Most of the mammillarias are native to Mexico, but some come from the southwest United States, the Caribbean, Colombia, Venezuela, Guatemala and Honduras.
 The common name "pincushion cactus" refers to this and the closely related genus "Escobaria". Boronia safrolifera
Boronia safrolifera, commonly known as safrole boronia, is a flowering plant that is endemic to south-eastern Australia.
 It grows to between 0.5 and 1 metres high and has pinnate leaves.
 Deep pink, pale pink or white four-petalled flowers appear between August and November in the species native range. Boronia muelleri
Boronia muelleri, the forest boronia, is a flowering plant that occurs in open forest in Victoria and New South Wales in Australia.
 It grows to between 0.8 and 3 metres in height and has scented, pinnate leaves which have 7 and 17 leaflets, each 5 to 25 mm long and 1 to 3 mm wide.
 Pale pink flowers appear between October and February in the species native range.
 These are produced in clusters of 1 to 7 on 7 to 15 mm long pedicels. Boronia serrulata
Boronia serrulata, commonly called the native rose or Sydney rose, is a shrub about 1m high with a 1m spread.
 It has crowded rhomboid leaves and bright pink cup-shaped flowers with a pleasant fragrance.
 Like many other Boronias, the leaves are strongly aromatic when crushed Boronia algida
Boronia algida, commonly known as alpine boronia, is a flowering plant that is endemic to south-eastern Australia.
 Pale pink or white four-petalled flowers appear between September and January in the species native range. Escobaria missouriensis
Escobaria missouriensis, the Missouri foxtail cactus and formerly "Coryphantha missouriensis", is a species of low-growing North American cacti.
 It is found in along the Missouri River in the tallgrass prairie and shortgrass Great Plains, from Texas to Montana and the Dakotas, and in the Rocky Mountains woodlands of Ponderosa pine ("Pinus ponderosa"), pinyon-juniper, and Gambel oak ("Quercus gambelii)" west of it.
 It is also native to the Southwestern United States in Arizona, New Mexico, and Utah. Boronia anemonifolia
Boronia anemonifolia, commonly known as narrow-leaved boronia or sticky boronia, is a flowering plant that is endemic to south-eastern Australia.
 Pale pink or white four-petalled flowers appear between August and April in the species native range. Escobaria sneedii
Escobaria sneedii (syn.
 "Coryphantha sneedii") is a rare species of cactus known by the common names Sneed's pincushion cactus and carpet foxtail cactus.
 It is native to the Chihuahuan Desert, where it occurs in scattered locations in New Mexico, Texas, and Chihuahua.
 Some plants occurring in Arizona may be included within this species.
 Botanical authors do not necessarily agree on the circumscription of this species.
 Most will agree at this point in the research, however, that there are two varieties of "Escobaria sneedii", and that both are rare and endangered.
 The plant is popular with cactus enthusiasts and dealers because of its often petite size and tolerance for moderately cold climates.
 They have been overharvested from their natural habitat, the main reason why the two varieties, var.
 "sneedii" and var.
 "leei", have been federally listed as endangered and threatened, respectively.