Primula verticillata (Section Sphondylia)
P. verticillata grows on wet, north facing, limestone cliffs in Saudia Arabia and Yemen. See P. simensis which is a disjunct, heavily farinous species found in Ethiopia and maybe considered a subspecies of P. verticillata. P. verticillata crosses with P. floribunda (sterile usually, but a fertile form was produced called P. X kewensis) and P. edelbergii (sterile).
