The two petals to the side of the upper lobe are known as the upper wings. The lower petals are known as the lower wings. The shapes may change somewhat from year to year on the same plant, and they may change from plant to plant grown in different locations. Colors may also change in these ways. The exact reasons for these changes are not known.
Petal shapes range from pointy to rounded to linear.
Petal margins may be flat, wavy, ruffled or frilled, or twisted. Flower size, if not specified, is given as the width, or the distance between the tips of the two upper wing petals. The size may vary slightly for different plants of a given variety, particularly when planted in different locations. One approach is to describe a color by matching it to a complete and consistent set of color charts and names for each of the many thousands of different colors. Toward that end, a number of color charts and sets of color names have been created over the years.