GTM's comment yesterday about the "Livelong" name of the Orpine has led me to do some research, and I am amazed to find that it is just one of many names for this familiar plant. I say familiar, because its very close relative grows in our gardens as the Ice Plant - properly called Sedum spectabile in its 'tame' form. The wild form is Sedum telephium. Otherwise known as Livelong, Midsummer Men, Vazey flower, Alpine Broklimbe, Arpent or Arpent-weed, Harping Johnny, Jacob's Ladder, Lib-long, Orphan John, Orpies, Orall, Solomon's Puzzles. Arpent, etc., is a variant of Orpine, and Harping is probably a corruption of the same.
It has a rich folk-lore: "The people of the country delight much to set it in pots and shelles on Midsomer even, or upon timber slates or trenchers daubed with clay, and so to set or hang it up in their houses, whereas it remayneth greene a long season, and groweth if it be sometimes over sprinckled with water". And hence the name Midsummer Men. Orpies is a contraction for Orpine, and Orpy leaves were said to be good for wounds. The name Orpine was given first of all to yellow-flowered species, hence its origin. In Chaucer's day they called it Ornal.
Orpine was used as a charm against lightning. With St. John's Wort it was hung over the doorways to scare away witches. Formerly, too, it was employed as a love-charm."
Extract above taken from: