Are Hoodia and Monardella both plant genus names?
yes
Title: Hoodia
Passage: Hoodia (known locally as "ghaap" or "bobbejaanghaap") is a genus of flowering plants in the family Apocynaceae, under the subfamily Asclepiadoideae, native to Southern Africa.
Title: Monardella
Passage: Monardella is a genus of approximately 40 species of annual and perennial plants native to western North America from British Columbia to northwestern Mexico.  They are grown for their highly aromatic foliage, which in some species is used for herbal teas.  The two-lipped, tubular flowers are formed in terminal clusters and are most usually red, pink, or purple.
Title: Monardella purpurea
Passage: Monardella purpurea is a species of flowering plant in the mint family known by the common names Siskiyou monardella and serpentine monardella.
Hoodia Monardella