03/01/2022
"The Perks of Being a Sunflower."
Sunflowers are in the news.
So here are some pretty cool traits of sunflowers...and good reminders of how much goes on in nature, without any human awareness.
"What we commonly consider a single sunflower is actually a cluster of flowers, referred to as an inflorescence. All wild sunflowers, of which there are about 50 species in North America, have very similar inflorescences. To our eyes, their ligules (the enlarged, fused petals of the outermost whorl of florets in the sunflower inflorescence) are the same uniform, familiar bright yellow.
However, when looked at in the UV spectrum (that is, beyond the type of light that our eyes can see), things are quite different. Sunflowers accumulate UV-absorbing pigments at the base of the ligules. Across the whole inflorescence, this results in a UV bullseye pattern."
Sunflowers have hidden patterns of ultraviolet colours — visible to pollinators, these colours are due to the presence of pigments that also help plants retain moisture.