At last, I got a Arthurium Reptans!! (I mutate a citrus reptans)
I have cross-breeded all the tier 4 flowers I can and now I miss 9 plants: venus, tahitian, lilia, baccatus, tilia Reptans + lilia, baccatus, tilia Scandens + tilia Orchid. I have to mutate them! With the help of your guide!!!

(I still hope to be able to buy one of them, but it's long to wait each 24 hours!!)