Even experts do not always agree. Everything is just one source for your consideration.
I really don't understand wikipedia and why it's the site everyone goes to. I avoid it, and the only time I might visit is to see if there is a reference I missed. The reference section in the Perovskia page is really embarrassing!
---- GRIN has never claimed to be anything more than agriculture related. It not at all comprehensive, and only lists two Perovskia spp.
---- There are only three references, and no where in the references are there more than two (count them two!) Perovskia species listed. (So where did the writer get nine?)
---- Click on any species link (except for P. atriplicifolia) in the article body and they bring you to a a wikipedia "page" for said species that exists in title only.
