Cotton wood Hibiscus or Hibiscus tiliaceus is a species of flowering tree in the mallow family, Malvaceae, that is native to the Old World tropics. Common names include Sea Hibiscus, Beach Hibiscus, Coastal (or Coast) Hibiscus, Coastal (or Coast) Cottonwood, Green Cottonwood, Native Hibiscus, Native Rosella, Cottonwood Hibiscus, Kurrajong, Sea Rosemallow, Norfolk Hibiscus, Hau (Hawaiian), and Purau.tiliaceus reaches a height of 4–10 m (13–33 ft), with a trunk up to 15 cm (5.9 in) in diameter. The flowers of H. tiliaceus are bright yellow with a deep red centre upon opening. Over the course of the day, the flowers deepen to orange and finally red before they fall. The branches of the tree often curve over time.