Question: Which plant, Buddleja or Burchardia, is an herb named after a German botanist?

Context paragraphs:
Burchardia: Burchardia is a genus of herbs that are endemic to Australia.  The genus is named for Johann Heinrich Burkhardt, a German botanist.

Buddleja alata: Buddleja alata is endemic to western Szechuan, China, growing at elevations of 1,300–3,000 m; it was first described and named by Rehder and Wilson in 1913.  Leeuwenberg found the plant to be such a perfect intermediate of "Buddleja albiflora" and "Buddleja nivea" as to consider it a hybrid of the two species.

Buddleja × whiteana: Buddleja × whiteana is a hybrid of "Buddleja alternifolia" and "Buddleja asiatica" made at the Blandy Experimental Farm, Boyce, VA, USA, in 1948 by R.J.Moore.  The plant was named for Orlando E. White, Director of Botany at Blandy.  However, the taxonomy of the plant is a matter of contention, the RBG Kew "Plantlist" treating the status of its name as 'unresolved'.  

Rosemary (given name): Rosemary is a feminine given name, a combination of the names Rose and Mary.  It can also be used in reference to the herb named rosemary.  Rosemary has been in steady use in the United States and has ranked among the top 1,000 for 110 years.  It was ranked as the 754th most popular name for American girls born in 2008.  Its greatest period of popularity in the United States was between 1925 and 1950, when it was ranked among the top 150 names for girls.  Rosemarie is another variant, and Romy is a German nickname for the name.

Buddleja: Buddleja, or Buddleia (also historically given as "Buddlea"), commonly known as the butterfly bush, is a genus comprising over 140 species of flowering plants endemic to Asia, Africa, and the Americas.  The generic name bestowed by Linnaeus posthumously honoured the Reverend Adam Buddle (1662–1715), an English botanist and rector, at the suggestion of Dr. William Houstoun.  Houstoun sent the first plants to become known to science as buddleja ("B. americana") to England from the Caribbean about 15 years after Buddle's death.

Ursinia nana: Ursinia nana DC.  is a Southern African annual herb belonging to the Daisy family of Asteraceae.  It is a pioneer plant of disturbed ground and usually grows to a height of only 30 cm.  It flowers throughout the rainy season and, in mild weather with late rains, well into the autumn months.  The leaves are deeply laciniate and bunched.  In his 1912 contribution to "Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie", the enigmatic German botanist Reinhold Conrad Muschler describes "Ursinia engleriana", found near Okahandja in South West Africa, as a new species of African composite.  Later this was considered to be the same as "Ursinia nana" described by de Candolle.  Muschler praised the species as being extremely ornamental.

Anthonius Josephus Maria Leeuwenberg: Anthonius Josephus Maria "Toon" Leeuwenberg (11 August 1930 in Amsterdam – 2010) was a Dutch botanist and taxonomist best known for his research into the genus "Buddleja" at the Laboratory of Plant Taxonomy and Plant Geography, Wageningen.  He was responsible for sinking many Asiatic species as varieties, notably within "Buddleja crispa".  In 1962, he worked with Jan de Wilde on the flora of the Ivory Coast.

Buddleja 'Pink Pagoda': Buddleja 'Pink Pagoda' (sold as in the USA) is a sterile hybrid cultivar raised in 1998 by Peter Moore, Chief Propagator at the Longstock Park Nursery in Hampshire, England, and named by Roy Lancaster.  The cultivar is the result of a crossing of "Buddleja" 'Pink Delight' with "Buddleja × weyeriana" 'Golden Glow'.  Plant Breeders' Rights were awarded in 2008.

Buddleja × lewisiana: Buddleja × lewisiana is an American hybrid of "Buddleja madagascariensis" and "Buddleja asiatica" first described and named by T H Everett in 1947, and introduced to commerce in 1958.  The taxonomy of the plant remains a matter of contention.

Odontonema brevipes: Odontonema brevipes is a species of plant in the family Acanthaceae which is endemic to Trinidad and Tobago.  The species is only known from four localities in the Main Ridge of Tobago.  It was described by German botanist Ignatz Urban in his "Symbolae Antillanae", based on collections made by Danish botanist Henrik von Eggers and English-born Trinidadian botanist Walter Elias Broadway.

Supporting paragraphs: Buddleja Burchardia
Answer: Burchardia