In article wim1c.106182$Xp.456690@attbi_s54, Pam - gardengal
writes
Hollyhock
rust is specific to hollyhocks and other members of that family (Malvaceae).
Make sure other susceptible species are planted well away from the affected
plants.

In my experience, it's Alcea rosea and Malva sylvestris that get hit the
worst, but I've seen it on several other species. I've got another
plant, labelled as Lavatera "Creticoides" until I work out what it
really is, which also gets hit hard.
--
Stewart Robert Hinsley
http://www.meden.demon.co.uk/Malvaceae/Malvaceae.html