During a kayaking trip up the Wailua River in Kaua’i, Hawai’i I noticed these bright yellow flowers that speckled the shoreline.  Our tour guide described them as “sunset” flowers because they start the day with a rich, yellow color, and end the day with a red-orange hue.

“Sunset” flower, Wailua River, Kaua’i, Hawai’i

“Sunset” flower, Kaua’i, Hawai’i