Green flowers of Zizotes milkweed (Asclepias oenotheroides) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest. Texas

🎞️ #3607-26

The top photograph shows green flowers of Zizotes milkweed (Asclepias oenotheroides) when exposed to regular daylight. The bottom photograph depicts the same flower illuminated by a 365 nm ultraviolet (UV-A) blacklight.

**Key Features:**

* **Flower Color:** In both photographs, the flowers appear green.
* **Light Source:** The top photograph shows natural daylight, while the bottom one uses a UV-A light source.
* **Comparison:** The illumination from the UV-A light causes an increase in fluorescence from chlorophyll and other pigments. This results in a more intense green color compared to regular daylight.

**Conclusion:**

The photographs demonstrate that Zizotes milkweed flowers exhibit increased fluorescence under UV-A light, making them appear brighter or more vibrant than under natural conditions. – AI vision

🇪🇸 Descripción en español / Spanish Description

Las flores verdes de la asclepiada de zizotes (Asclepias oenotheroides) cuando se exponen a la luz diurna regular y también cuando se iluminan con una luz negra ultravioleta (UV-A) de 365 nm del Richards Loop Trail en el Bosque Nacional Sam Houston, Texas, agosto 24, 2024. La fotografía superior muestra flores verdes de la asclepiada de zizotes (Asclepias oenotheroides) cuando se exponen a la luz diurna regular. La fotografía inferior representa la misma flor iluminada con una luz negra ultravioleta (UV-A) de 365 nm. **Características clave:** * **Color de las flores:** En ambas fotografías, las flores aparecen verdes. * **Fuente de luz:** La fotografía superior muestra luz natural diurna, mientras que la inferior utiliza una fuente de luz UV-A. * **Comparación:** La iluminación de la luz UV-A provoca un aumento en la fluorescencia de la clorofila y otros pigmentos. Esto da como resultado un color verde más intenso en comparación con la luz diurna natural. **Conclusión:** Las fotografías demuestran que las flores de la asclepiada de zizotes exhiben una mayor fluorescencia bajo luz UV-A, lo que hace que parezcan más brillantes o vibrantes que en condiciones naturales. – Spanish translation

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