Question: Which genus of plants is endemic to Australia, Retama or Baeckea?

Context paragraphs:
Retama: Retama is a genus of flowering bushes in the legume family, Fabaceae.  It belongs to the broom tribe, Genisteae.  "Retama" broom bushes are found natively in North Africa, the Levant and some parts of southern Europe.  "Retama raetam" and "Retama monosperma" have white flowers, while "Retama sphaerocarpa" has yellow flowers.  It remains an open question in taxonomy whether the members of the "Retama" genus should be incorporated into the genus "Genista" (see Genisteae).  The name traces itself to the Hebrew "רותם (Pronounced Rotem)"

Euryomyrtus ramosissima: Euryomyrtus ramosissima (Rosy Baeckea) is a shrub in the myrtle family (Myrtaceae).  The species is endemic to Australia.  It is spreading in habit and grows to 60 cm in height.  Its leaves are dark green, long and narrow ranging from 3 to 13 mm in length and 1 to 3 mm in width.  White, pink or mauve flowers with circular petals are produced between June and February in its native range.

Sannantha pluriflora: Sannantha pluriflora, commonly known as tall baeckea, is a flowering shrub or small tree species in the myrtle family, Myrtaceae.  It is endemic to Australia.  Plants grow to 4 metres high.  White flowers appear in groups of 3 to 7 between October and April in the species native range.  These have 5 rounded petals surrounding 8 to 15 stamens.  The fruits are 2.5 to in diameter.

Babingtonia: Babingtonia is a genus of flowering plants in the myrtle family, Myrtaceae.  The species are native to Australia.  Many species formerly placed in the genus are currently included in "Sannantha", "Baeckea", "Oxymyrrhine", "Kardomia", "Seorsus" and "Harmogia".

Sannantha bidwillii: Sannantha bidwillii is a species in the myrtle family, Myrtaceae.  It is endemic to Queensland in Australia.  The species was first formally described in 1997 and given the name "Babingtonia bidwillii".  In 2007 it was placed in the newly created genus "Sannantha".  For many years the name "Baeckea virgata" was misapplied to this species.  "Baeckea virgata", currently "Sannantha virgata", is endemic to New Caledonia.

Baeckea elderiana: Baeckea elderiana is a shrub endemic to central Western Australia.

Baeckea: Baeckea is a genus of flowering plants in the myrtle family, Myrtaceae.  There are about 75 species, of which 70 are endemic to Australia; the others are distributed in New Caledonia and Southeast Asia.

Astartea fascicularis: Astartea fascicularis is a species of flowering plant in the myrtle family, Myrtaceae.  It is endemic to southwestern Western Australia, where it is widespread in the Recherche Archipelago and present on the mainland in Cape Le Grand National Park.  It is commonly known as Recherche astartea.  or false baeckea.

Baeckea muricata: Baeckea muricata is a shrub endemic to Western Australia.

Kardomia: Kardomia is a genus of flowering plants in the family Myrtaceae.  The genus was first formally described in 2007 and includes species previously included in "Baeckea" and "Babingtonia".  The entire genus is native to northeastern Australia (States of New South Wales and Queensland)

Supporting paragraphs: Retama Baeckea
Answer: Retama