This image presents a comparative view of blooming bastard pennyroyal (Trichostema dichotomum) plants under two different lighting conditions: regular daylight and UV-A blacklight illumination.
**Daylight Image**
The top half of the image shows the plant in its natural state, illuminated by regular daylight. The flowers appear as a soft purple color with five petals each, and are surrounded by green leaves. The background is a solid gray color, providing a neutral contrast to the plant's colors.
**UV-A Blacklight Image**
In contrast, the bottom half of the image displays the same plant when exposed to UV-A blacklight from Lick Creek Park in College Station, Texas. Under this specialized lighting, the flowers exhibit a vibrant pinkish-purple hue with five petals each, while the leaves remain green. The background remains gray.
**Overall Observation**
Notably, the use of UV-A blacklight highlights the presence of fluorescent pigments in the plant's flowers, which are not visible under regular daylight conditions. This phenomenon is often referred to as "fluorescence" or "UV-induced fluorescence." The image effectively demonstrates how different lighting conditions can reveal new details about a subject's appearance and properties.
**Conclusion**
In summary, this image showcases the unique effects of UV-A blacklight illumination on the blooming bastard pennyroyal plant, highlighting its fluorescent pigments and providing a fascinating visual comparison between natural daylight and specialized lighting conditions. – AI vision
