Robert Duncan is a generous-flowering Rose, the blossoms of which are large, perfectly formed and graceful in their proportions.  The petals are large, shell-shaped and curly.  The plant attains moderate size, but is of sturdy formation.  The color — light scarlet or rosy lake — is delicate from the first faint streaks observable, as the buds begin to open, until the petals fall.  When planted in masses the effect is decidedly pleasing.  [Samuel Todd Walker, 1913 Biltmore Roses]