My top photo shows a cupped flower but it eventually flattens out as shown in the lower photo.  I am still evaluating this young plant.

Cultivar: Nadia
Year: 1941
Seedling No: 10644-M. Pages 22 & 44 of Saunders’ Notebook I
Parentage: 7: lactiflora ‘Marie Jacquin’ X “lobata of Perry”
Flower: Color: dark cherry, lighter flares
Form: semi-double, 2-3 rows of petals, about 14-18, rather flat
Blooms: Week 5
Carpels: 3-5, light greenish-yellow
Stigmas: light pink, “pointing together” (Silvia Saunders)
Disc: white, small
Stamens: filaments light yellow
Plant: Habit: upright
Foliage color: medium green
Foliage form: narrow, pointed leaves, somewhat incurved
Height: 38″ (reported); 35″ in 2021
Recommendation: Recommended
Availability: Rare