Question: Which genus of flowering plants contains eight species all from the western Cape Province of South Africa, Calycanthus or Coleonema?

Context paragraphs:
Constitution of the Western Cape: The Constitution of the Western Cape is, subject to the Constitution of South Africa, the highest law regulating the structure and powers of the government of the Western Cape province of South Africa.  It was enacted by the Western Cape Provincial Legislature in terms of Chapter 6 of the national constitution, and came into force on 16 January 1998.  The Western Cape is the only South African province to have adopted a constitution.

Mossel Bay: Mossel Bay is a harbour town of about 130,000 people on the Southern Cape (or Garden Route) of South Africa.  It is an important tourism and farming region of the Western Cape Province.  Mossel Bay lies 400 kilometres east of the country's seat of parliament, Cape Town (which is also the capital city of the Western Cape Province), and 400 km west of Port Elizabeth, the largest city in the Eastern Cape Province.  The older parts of the town occupy the north-facing side of the Cape St Blaize Peninsula, whilst the newer suburbs straddle the Peninsula and have spread eastwards along the sandy shore of the Bay.

Coleonema: Coleonema is a genus of flowering plants in the family Rutaceae.  The eight known species are all from the western Cape Province of South Africa.  In Australia, where they are cultivated as garden ornamentals, they are often incorrectly referred to as Diosma.

Paarl: Paarl ( ; Afrikaans: ] or more commonly ] ; derived from "Parel", meaning "Pearl" in Dutch) is a city with 191,013 inhabitants in the Western Cape province of South Africa.  It is the third oldest town and European settlement in the Republic of South Africa (after Cape Town and Stellenbosch) and the largest town in the Cape Winelands.  Due to the growth of the Mbekweni township, it is now a de facto urban unit with Wellington.  It is situated about 60 km northeast of Cape Town in the Western Cape Province and is renowned for its haunting scenic beauty and deep viticulture and fruit growing heritage.

Cape Province: The Province of the Cape of Good Hope (Afrikaans: "Provinsie van die Kaap die Goeie Hoop" ), commonly referred to as the Cape Province (Afrikaans: "Kaapprovinsie" ), was a province in the Union of South Africa and subsequently the Republic of South Africa.  It encompassed the old Cape Colony, and had Cape Town as its capital.  Following the end of the Apartheid era, the Cape Province was split up to form the new Eastern Cape, Northern Cape and Western Cape provinces.

Calycanthus: Calycanthus (sweetshrub) is a genus of flowering plants in the family Calycanthaceae, endemic to North America.  The genus includes two to four species depending on taxonomic interpretation; two are accepted by the "Flora of North America".

Western Cape Division: The Western Cape Division of the High Court of South Africa (previously named the Cape Provincial Division and the Western Cape High Court, and commonly known as the Cape High Court) is a superior court of law with general jurisdiction over the Western Cape province of South Africa.  The division, which sits at Cape Town, consists of 31 judges led by Judge President John Hlophe.

W. E. G. Louw: William Ewart Gladstone Louw (31 May 1913 in Sutherland, formerly Cape Province, now Northern Cape Province in South Africa – 24 April 1980 in Stellenbosch, Western Cape Province, South Africa), was an Afrikaner poet and is in the main known to the literary world merely as W.E.G. Louw.  He was the younger brother of the poet N. P. van Wyk Louw.

Heritage Western Cape: Heritage Western Cape (HWC) is a provincial heritage resources authority established by the Minister of Cultural Affairs and Sport of the government of the Western Cape province in South Africa.  It is a public entity set up under the terms of the National Heritage Resources Act.  It is mandated to care for that part of South Africa's national estate that is of provincial and local significance in the Western Cape.  It may delegate responsibility for heritage resources of local significance to competent municipal governments.

University of the Western Cape Stadium: University of the Western Cape Stadium, commonly abbreviated and referred to as UWC Stadium, and sometimes also referred to as University of the Western Cape Sports Ground, is a multi-use stadium, situated in the Bellville suburb of Cape Town, at the Western Cape Province in South Africa.  The exact location, is at the Southeastern corner of University of the Western Cape, only 300m from the Unibell railway station.  Since its construction in 1983, the stadium has been home to UWC athletics, rugby, soccer and numerous other sporting events and local gatherings.  The stadium complex also feature several offices, and became the new official SAFA headquarters for the West Coast Regional League, in August 2006.

Supporting paragraphs: Calycanthus Coleonema
Answer: Coleonema