Mei-Shun thought it came from mirabilis jalapa around her place. It might be right, while she lately found her 忍冬=suikazura, Japanese honeysuckle in blossom as well. The latter is also called 金銀花=gold-and-white flower, maybe because older flowers stay in yellow beside younger newly bloom in white. Would you come into this Persian vase made of copper, Shin brought home the other day?