Most of the warm-temperate pings(lutea, ionantha, caerulea, planifolia, and to a less certain extent, primuliflora) look alike when they are not in flower. Primuliflora can be easy to spot in a collection by the number of plantlets it produces. All of the planifolia I have seen are colored red/green or a deep red(lots of sun). I have never heard of or seen an alba form of planifolia, although it could exist. Of all the photos of ionantha I have seen, the plants have green/light green/yellowish rosettes like lutea and caerulea.