Correspondence between Silvia Saunders and H.F. DuPont suggests he may have reported this plant growing to 5′ but he likely confused ‘Echo’ with another plant, #16737, as he referred to it by that number. I think we can safely retire its description as a five foot tall plant!

Cultivar: Echo
Year: 1951 or 1952
Seedling No: 10962
Parentage: 1B: F2 of (lactiflora X anomala)
Flower: Color: very pale pink
Form: single, 8 petals, crinkled
Blooms: Week 4
Carpels: 2, light green
Stigmas: dark red
Disc: [DISC]
Stamens: filaments red at base, shading to yellow
Plant: Habit: [HABIT]
Foliage color: medium green
Foliage form: [FORM]
Height: 25″ reported (Wister)
Recommendation: Collectors’ plant
Availability: One or a few specialty nurseries