It would be very difficult to identify the flower. Common flower names vary from locality to locality. Scientific botanical names change as more precise work is done on classification. A wild guess is that the flower is pale pink, since blue and green are the other colors mentioned. My guess is eglantine, a pale pink species of rose sometimes called sweetbrier. Neither emanita nor amanita appear in Stern's botanical Latin dictionary for flowering plants (the latter in the fungal names only), or in Hutchinson. Whatever, it is a fine old song; I especially like Newfoundlander's version.