title: Evolving words and the egg-bearing tubes of Welwitschia (Welwitschiaceae).
authors: Department of Organismic and Evolutionary Biology, 26 Oxford Street, Harvard University, Cambridge, Massachusetts 02138 USA; and Arnold Arboretum of Harvard University, 1300 Centre Street, Boston, Massachusetts 02131 USA.
authors: William E
authors: WE
authors: Friedman
mesh_terms: D005075:Biological Evolution; D035682:Gnetophyta; D056771:Ovule; D010802:Phylogeny; D012098:Reproduction
keywords: Gnetales; Welwitschia; alternation of generations; gametophyte; prothallial tubes; seed plants