Question: Are both Ardisia and Encelia plant genera? 

Context paragraphs:
Encelia actoni: Encelia actoni, also known by the common names Acton brittlebush and Acton encelia, is a species of flowering plant in the daisy family.

Ardisia humilis: Ardisia humilis is a species of flowering plant in the genus "Ardisia" in the family Primulaceae, native to southeastern Asia in southern China (Guangdong, Hainan), the Philippines, and Vietnam.

Ardisia crenata: Ardisia crenata is a species of flowering plant in the primrose family, Primulaceae, that is native to East Asia.  It is known by a variety of names such as Christmas berry, Australian holly, coral ardisia, coral bush, coralberry, coralberry tree, hen's-eyes, and spiceberry.  "A. crenata" is a compact shrub that reaches 1 m , often with a single stem.  Leaves are dark green, thick, glossy, and have tightly waved edges The flowers are small, white or reddish, fragrant, and form clusters.  The fruit is a glossy, bright red drupe.  The seeds are able to germinate under a dense canopy and are dispersed by birds and humans.

Australian Cultivar Registration Authority: The Australian Cultivar Registration Authority (ACRA) is the International Cultivar Registration Authority (ICRA) for Australian plant genera, excluding those genera or groups for which other ICRAs have been appointed.

Matthew Jebb: Matthew Hilary Peter Jebb (born 1958) is an Irish botanist and taxonomist specialising in the ant plant genera "Squamellaria", "Myrmecodia", "Hydnophytum", "Myrmephytum" and "Anthorrhiza", as well as the carnivorous plant genus "Nepenthes".

Ardisia: Ardisia (coralberry or marlberry) is a genus of flowering plants in the family Primulaceae.  It was in the former Myrsinaceae family now recognised as the myrsine sub-family Myrsinoideae.  They are distributed in the Americas, Asia, Australia, and the Pacific Islands, mainly in the tropics.  There are 400 to 500 species.

Encelia: Encelia is a genus of the plant family Asteraceae.  It consists of shrubs (and one geophyte) of arid environments in southwestern North America and western South America.

Robert Brown (botanist, born 1773): Robert Brown FRSE FRS FLS MWS (21 December 1773 – 10 June 1858) was a Scottish botanist and palaeobotanist who made important contributions to botany largely through his pioneering use of the microscope.  His contributions include one of the earliest detailed descriptions of the cell nucleus and cytoplasmic streaming; the observation of Brownian motion; early work on plant pollination and fertilisation, including being the first to recognise the fundamental difference between gymnosperms and angiosperms; and some of the earliest studies in palynology.  He also made numerous contributions to plant taxonomy, including the erection of a number of plant families that are still accepted today; and numerous Australian plant genera and species, the fruit of his exploration of that continent with Matthew Flinders.

Encelia frutescens: Encelia frutescens is a species of flowering plant in the daisy family known by the common names button brittlebush and bush encelia.

Carduus: Carduus is a genus of flowering plants in the aster family, Asteraceae, and the tribe Cynareae, one of two genera considered to be true thistles, the other being "Cirsium".  Plants of the genus are known commonly as plumeless thistles.  They are native to Eurasia and Africa, and several are known elsewhere as introduced species.  This genus is noted for its disproportionately high number of noxious weeds compared to other flowering plant genera.

Supporting paragraphs: Ardisia Encelia
Answer: yes