Photo 3825-15: Slender vervain (verbena) when exposed to regular...of Somerville Lake State Park. Texas


Slender vervain (verbena) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Birch Creek Unit of Somerville Lake State Park. Texas, May 16, 2026

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Slender vervain (verbena) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Birch Creek Unit of Somerville Lake State Park. Texas, May 16, 2026