Hel·i·chry·sum n.  Bot. A genus of composite plants, with shining, commonly white or yellow, or sometimes reddish, radiated involucres, which are often called “everlasting flowers.”
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  Im·mor·telle n.; pl. Immortelles   Bot. A plant with a conspicuous, dry, unwithering involucre, as the species of Antennaria, Helichrysum, Gomphrena, etc. See Everlasting.
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  Helichrysum
       n : large genus of mostly African and Australian herbs and
           shrubs: everlasting flowers; in some classifications
           includes genus Ozothamnus [syn: genus Helichrysum]