Are both Firmiana and Petasites a genus of flowering plants in the Malvaceae family?
no
Title: Reevesia
Passage: Reevesia is a genus of flowering plant in the Malvaceae family.
Title: Firmiana
Passage: Firmiana (parasoltree) is a genus of flowering plant in the Malvaceae family, formerly placed in the now defunct Sterculiaceae.  Genus name honors Karl Joseph von Firmian.
Title: Petasites
Passage: Petasites is a genus of flowering plants in the sunflower family, Asteraceae, that are commonly referred to as butterburs and coltsfoots.  They are perennial plants with thick, creeping underground rhizomes and large rhubarb-like leaves during the growing season.
Firmiana Petasites