Do Waldsteinia and Obregonia contain the same number of species?
Obregonia Obregonia, the artichoke cactus, is a genus of cacti with a single species, Obregonia denegrii. The species is endemic to the state of Tamaulipas in Mexico.
Woodwardia areolata Woodwardia areolata, the netted chain fern, is a species of fern native to eastern North America. It is usually treated in the genus "Woodwardia", in the eupolypods II clade of the order Polypodiales, in the class Polypodiopsida. It is sometimes transferred to the monotypic genus "Lorinseria" as "Lorinseria areolata" (L.) C.Presl, on the basis of its anastamosing veins and lobed frond form, as well as its more marked frond dimorphism; however, the genus name "Lorinseria" is invalid, being an orthographical variant of "Lorinsera" Opiz ("Flora of North America").