Question: Are Heliopsis and Stapelia native to the same continent?

Context articles: Heliopsis helianthoides
Stapelia
Heliopsis procumbens
Heliopsis buphthalmoides
Heliopsis parviceps
Heliopsis anomala
Heliopsis
Heliopsis parvifolia
Heliopsis novogaliciana
Stapelia gigantea

Heliopsis helianthoides is a species of flowering plant in the family Asteraceae, known by the common names rough oxeye, smooth oxeye and false sunflower.
 It is native to eastern and central North America from Saskatchewan east to Newfoundland and south as far as Texas, New Mexico, and Georgia.
Stapelia is a genus of low-growing, spineless, stem succulent plants, predominantly from South Africa with a few from other parts of Africa.
 Several Asian and Latin American species were formerly included but they have all now been transferred to other genera.
 The flowers of certain species, most notably "Stapelia gigantea", can reach 41 cm (16 inches) in diameter when fully open.
 Most "Stapelia" flowers are visibly hairy and generate the odour of rotten flesh when they bloom; a notable exception is the sweetly scented "Stapelia flavopurpurea".
 Such odours serve to attract various specialist pollinators including, in the case of carrion-scented blooms, blow flies of the dipteran family Calliphoridae.
 They frequently lay eggs around the coronae of "Stapelia" flowers, convinced by the plants' deception.
Heliopsis procumbens is a Mexican species of flowering plant in the family sunflower family.
 It is native to central Mexico from Jalisco and Michoacán east to Veracruz.
Heliopsis buphthalmoides is a New World species of flowering plant in the family sunflower family.
 It is the only member of its genus native to both North America and South America.
 It is found in Mexico (from Durango and Sinaloa south to Chiapas), all 7 countries of Central America, and western South America (Colombia, Venezuela, Perú, and Bolivia).
Heliopsis parviceps is a Mexican species of flowering plant in the family sunflower family.
 It is native western Mexico in the states of Sinaloa, Michoacán, Guerrero, and México.
Heliopsis anomala is a Mexican species of flowering plant in the family sunflower family.
 It is native northwestern Mexico in mountains and canyons near the Gulf of California.
 It has been found in both states of the Baja California Peninsula as well as in Sonora (including Isla Tiburón).
Heliopsis is a genus of herbaceous flowering plants in the sunflower family, native to dry prairies in North and South America.
 The sunflower-like composite flowerheads are usually yellow, up to 8 cm in diameter, and are borne in summer.
 Species are commonly called ox-eye or oxeye.
Heliopsis parvifolia is a North American species of flowering plant in the family Asteraceae, known by the common name mountain oxeye.
 It is native to northern Mexico from Baja California east to Tamaulipas and south as far as Aguascalientes, as well as the southwestern United States (southern Arizona, southern New Mexico, western Texas).
Heliopsis novogaliciana is a Mexican species of flowering plant in the family sunflower family.
 It is native western Mexico in the Sierra Madre Occidental in the states of Jalisco, Nayarit, Sinaloa, Chihuahua and Durango.
Stapelia gigantea is a species of flowering plant in the family Apocynaceae, native to south eastern Africa.
 Growing up to tall, it is a clump-forming succulent with erect green stems 3 cm thick.
 In summer, it bears large star-shaped five-petalled flowers up to 25 cm in diameter.
 The flowers are red and yellow, wrinkled, with a silky texture and fringed with hairs, that can be as long as .
 They have the smell of rotting flesh, in order to attract the flies which pollinate them.
 Despite the foul odor of its flower, "S. gigantea" can act as an appetite suppressant in humans.
 The plant is commonly referred to as Zulu giant, carrion plant or toad plant (although the name "carrion plant" can also refer to "Stapelia grandiflora").
 "Stapelia gigantea" sometimes also goes by the name of "Stapelia nobilis" or "Stapelia marlothii".