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From The Collaborative International Dictionary of English v.0.48:
Welwitschia \Wel*witsch"i*a\, n. [NL. So named after the discoverer, Dr. Friedrich Welwitsch.] (Bot.) An African plant (Welwitschia mirabilis) belonging to the order Gnetaceae. It consists of a short, woody, topshaped stem, and never more than two leaves, which are the cotyledons enormously developed, and at length split into diverging segments. [1913 Webster]