Viscum album "Phoradendron leucarpum" is used in North America in lieu of the European "Viscum album".) According to an old Christmas custom, a man and a woman who meet under a hanging of mistletoe were obliged to kiss. The custom may be of Scandinavian origin. It was alluded to as common practice in 1808 and described in 1820 by American author Washington Irving in his "The Sketch Book of Geoffrey Crayon, Gent.": In Germany, the Christmas tradition is that people who kiss under mistletoe will have an enduring love or are bound to marry one another. Every year, the UK town of
Viscum nudum"), but with the plant drawing its mineral and water needs from the host tree. Different species of "Viscum" tend to use different host species; most species are able to use several different host species. The flowers are inconspicuous, greenish-yellow, diameter. The fruit is a berry, white, yellow, orange, or red when mature, containing one or more seeds embedded in very sticky juice; the seeds are dispersed when birds (notably the mistle thrush) eat the fruit, and remove the sticky seeds from the bill by wiping them on tree branches where they can germinate. "Viscum" species are poisonous to humans;