Sunflower (Helianthus Annuus), Helios=Sun+Anthos=Flower (Greek stems) comes in a number of varieties, and colours ranging from daylight yellows to deep brown to sunset reds.
Artists throughout the history, like Vincent Willem Van Gogh (Dutch post-Impressionist, 1853-1890), appreciated sunflower's unique splendour.
It's amazing how the tall stalks and petals of wild sunflowers are stretched towards the sun. This unique behaviour is known as Photo-tropism (Greek stem), and this has appeared and is viewed as a symbol of loyalty and constancy in many ancient myths.
The use of sunflower images as religious symbols has also been documented in some native societies.