Hollyhock (Alcea rosea L.) Division - Magnoliaphyta Class - Magnoliopsida Subclass - Dilleniidae Order - Malvales Family - Malvaceae Genus - Alcea This plant is part of the malvaceae family of plants, which includes some incredible ornamental flowers. Most of the mallows are quite invasive, producing lots of little seedlings which can take over whole areas. Weeds Taxonomic List List by Scientific Name List by Common Name