What is the Little Pearl Twist Orchid's mature size?

Two (2) feet (60.96 centimeters) is the mature size of the Little Pearl Twist Orchid (Spiranthes grayi).

Specifically, the orchid has a spiraling, slender, sleek look. It is topped by alternating or one-sided clusters of delicate flowers. Then there is nothing on the stem until the base, out of which two or three small, short-lived leaves tend to grow and die before flowering is initiated.