Publication: North American Flora 22(3): 253. 1908.
selected vouchers: WTU
Notes: Note that the orthographic variant Petrophyton is used in some references for this genus name.
From the Jepson Manual online: "Correspondence 1 indicates that Petrophyton is an orthographic variant, and that the correct spelling is Petrophytum, because Rydberg (Memoirs of the New York Botanical Garden 1:206--207. 1900) published the genus name by raising Eriogynia sect. Petrophytum (Nutt. ex Torr. & A. Gray) S. Watson to genus rank, albeit misspelling it as Petrophyton in the process. [Therefore, spelling of genus name corrected to Petrophytum, from Petrophyton previously in this Index, 27 May 2009.] "