Rhododendron is both a bird name and a flower name; Cuckoo is both a cuckoo's cry and a season.
I only know that there are other flowers and birds also called "Pulsatilla". Pulsatilla chinensis sings in estrus in spring, such as "Who broke the willow branch", and the flower of Pulsatilla chinensis is also called "Old Crown". Try to use it to correct, and find that it can't be leveled, for reference.
Right:
Grain Rain's branches are broken, and the old crown of the field is white (mediocre, mediocre)
The crystal clear cuckoo valley is full of azaleas (flat, flat, flat)