Pigment may be localized at nodes or at certain internodes. Other distinguishing points are thickness, hardness, branching habit, internode length, and node size. Wing characteristics are not generally changed by differences in environment. Flowers Flowers and flower color are distinctive features of varieties but by themselves cannot be used to identify varieties. Colors range from white to purple and may be solid or a combination of colors.
Anthers are prominent and vary in color.
They may be orange, lemon yellow, or greenish yellow. Other floral characters that may help confirm varietal identity are size of flower, profusion of blooms, hairiness and color of buds, and the size, frequency, and persistence of buds. Flower stalks range in color from green to various shades of purple and may be mottled. Leaf-like appendages, called stipples, at the base of the peduncles of the lowest inflorescence vary in size and may be spreading or may entirely clasp the peduncles or petioles. Tubers Characteristics of potato tubers that can be used to confirm identification are skin color, skin texture, shape, eye distribution, and eye depth and specific gravity.