Parentage: Blushing Princess x Salmon Dream. Blushing Princess is an F2 from P. lactiflora x Gwenda. Gwenda is an F2 from P. tenuifolia x P. mlokosewitschii. Salmon Dream is from Paula Fay x Moonrise. Paula Fay is from P. lactiflora x P. peregrina. Moonrise is an F2 from (another) P. lactiflora x P. peregrina. So Pink Vanguard has 4 species in its ancestry.
Seidl seedling number H-17. Early-Early Midseason, light milky pink, cupped Semi-double flower on a strong growing plant. Long, broad guard petals surround several rows of smaller inner petals having excellent substance, and stamens. Flower resists late freeze damage. Medium tall (40 inches) and erect, the plant is clothed in large blue-green leaflets. Side buds extend flowering. Seeds and pollen, parent of wanted forms.
The parentage is in fact:
Blushing Princess (=16350 F2) x Salmon Dream