Hand drawn tribulus terrestris flower. Original from Biodiversity Heritage Library. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/2880172/free-illustration-image-watercolor-flower-tribulus-terrestrial-yellowFree Image from public domain licensePng hand drawn tribulus terrestis illustration https://www.rawpixel.com/image/2881519/free-illustration-png-vintage-flower-watercolor-floral-bindiiView license