Question: Which has more species, Thunbergia or Eriostemon? 

Context paragraphs:
Nematolepis squamea: Nematolepis squamea , commonly known as Satinwood, is a shrub or small tree species which is endemic to Australia.  The species was first formally described in 1805 and named "Eriostemon squamea".

Thunbergia: 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 laurifolia: 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 mysorensis: 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.

Thunbergia gregorii: 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 alata: Thunbergia alata, commonly called Black-eyed Susan vine, is a herbaceous perennial climbing plant species in the Acanthaceae family.  It is native to Eastern Africa, and has been naturalized in other parts of the world.  It is found in Cerrado vegetation of Brazil and Hawaii, along with eastern Australia and the southern USA in the states of Texas and Florida.

Thunbergia erecta: 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 .

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.

Phebalium nottii: Phebalium nottii, the pink phebalium, is a shrub which is native to Queensland and New South Wales in Australia.  It grows to between 1 and 3 metres in height and produces pink flowers in the spring.  The stamens, which have bright yellow anthers, are distinctively offset to one side of the flower.  The species was first formally described and named as "Eriostemon nottii" by Ferdinand von Mueller in "Fragmenta Phytographiae Australiae" in 1868.  It was reclassified under the genus "Phebalium" in 1898 by Joseph Maiden and Ernst Betche.

Eriostemon: Eriostemon is a genus of flowering plants belonging to the family Rutaceae.  It is native to eastern Australia and includes just two species, "Eriostemon australasius" and "Eriostemon banksii".  "Eriostemon australasius", commonly known as pink wax flower, occurs between Fraser Island and Nowra and is a shrub of heathlands and low open woodlands.  "Eriostemon banksii" is endemic to Cape York Peninsula and is a shrub or small tree occurring in heathland and rainforest margins.

Supporting paragraphs: Thunbergia Eriostemon
Answer: Eriostemon