Initally considered P. farinosa, this species is distinguished by violet flowers with narrowly obcordate corolla lobes. Similar to P. algida, which has a shorter corolla tube, broader bracts and a more compact umbel. Leaves are obovate, rounded at the apex, with a broadly winged petiole and crenate-denticulate margin. White farina thickly present under the leaves but there are some forms where the farina is almost absent (forma efarinosa). Bracts are linear to linear-lanceolate and gibbous at the base.