Iris versicolor and Iris

Iris versicolor noun - A common iris of the eastern United States having blue or blue-violet flowers; root formerly used medicinally.

Iris and Iris versicolor are semantically related. In some cases you can use "Iris" instead a noun phrase "Iris versicolor".

Iris noun - Muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye; it forms the colored portion of the eye.

Iris versicolor and iris are semantically related. Sometimes you can replace phrase "Iris versicolor" with "Iris", this terms are similar.