Southern prairie aster (Eurybia hemispherica ...

The image features two photographs of a Southern prairie aster (Eurybia hemispherica) taken under different lighting conditions:

**Top photograph:**

* The flower is illuminated by regular daylight.
* It exhibits its natural coloration, with purple petals and a yellow center.

**Bottom photograph:**

* The same flower is illuminated using a 365 nm ultraviolet (UV-A) blacklight.
* Under UV-A illumination, the purple petals fluoresce brightly.

The background of both images appears to be dark, suggesting that they were taken at night or in a low-light environment. – AI vision