Thunbergia laurifolia, the laurel clockvine or blue trumpet vine, is native to India (Starr "et al.", 2003) and the Indomalaya ecozone, the species occurs from Indochina to Malaysia (Schonenberger, 1999).
 It is locally known as kar tuau in Malaysia and rang jeud (รางจืด) in Thailand (Chan & Lim, 2006).
Thunbergia erecta is a herbaceous perennial climbing plant species in the genus "Thunbergia" native to western Africa.
 Common names include bush clockvine and king's-mantle .
Thunbergia is a genus of flowering plants in the family Acanthaceae, native to tropical regions of Africa, Madagascar and southern Asia.
 "Thunbergia" species are vigorous annual or perennial vines and shrubs growing to 2-8 m tall.
 The generic name honours Carl Peter Thunberg.
Thunbergia mysorensis, also called Mysore trumpetvine or Indian clock vine, is a species of flowering plant in the family Acanthaceae.
 A woody-stemmed evergreen, this vine is cultivated in Spain (south) and native to southern tropical India.
 The specific epithet "mysorensis" is derived from the city of Mysore.
 Other vernacular names include brick & butter vine, lady's slipper vine, and dolls' shoes due to the flower shape and large size.
Celastrus scandens, commonly called American bittersweet or bittersweet, is a species of "Celastrus" that blooms mostly in June and is commonly found on rich, well-drained soils of woodlands.
 It is a sturdy perennial vine that may have twining, woody stems that are 30 ft or longer and an inch or more thick at the base.
 The stems are yellowish-green to brown and wind around other vegetation, sometimes killing saplings by restricting further growth.
 It has tiny, scentless flowers at the tips of the branches.
 It has colorful, orange fruits that are the size of a pea.
 These fruits are poisonous to humans when ingested, but are favorites of birds.
 "C. scandens" roots were used by Native Americans and pioneers to induce vomiting, to treat venereal disease, and to treat symptoms of tuberculosis.
Thunbergia annua (known as annual thunbergia) is a herbaceous upright plant, in the genus "Thunbergia", and is native to northeastern Africa.
 Although it has not been found there, it is a considered a potentially invasive weed in Queensland, Australia.
Celastrus, commonly known as staff vine, staff tree or bittersweet, is a genus in the Celastraceae family which comprises about 30-40 species of shrubs and vines.
 They have a wide distribution in East Asia, Australasia, Africa, and the Americas.
Thunbergia gregorii, commonly known as orange clockvine or orange trumpet vine, is a herbaceous perennial climbing plant species in the family Acanthaceae, native to East Africa and sometimes cultivated as an ornamental vine.
 The bright, pure all-orange flowers distinguish it from the related black-eyed Susan ("Thunbergia alata").
Thunbergia grandiflora is an evergreen vine in the family Acanthaceae.
 It is native to China, India, Nepal, Indochina and Burma and widely naturalised elsewhere.
 Common names include Bengal clockvine, Bengal trumpet, blue skyflower, blue thunbergia, blue trumpetvine, clockvine, skyflower and skyvine.
Celastrus orbiculatus is a woody vine of the Celastraceae family.
 It is commonly called Oriental bittersweet.
 Other common names include Chinese bittersweet, Asian bittersweet, Round-leaved bittersweet, and Asiatic bittersweet.
 "Celastrus orbiculatus" was introduced into North America in 1879, and is considered to be an invasive species in eastern North America.
 It closely resembles the native North American species, "Celastrus scandens", with which it will readily hybridize.

Question: Are Celastrus and Thunbergia native to the Americas?
Answer: no