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Johannes Ludwig Emil Robert von Hanstein (May 15, 1822 - August 27, 1880) was a German botanist who was a native of Potsdam. He attended classes at the ''Gärtnerlehranstalt'' (Institute of Horticulture) in Potsdam, and later studied sciences in Berlin, attaining his doctorate in 1848. In 1855 he was a lecturer of botany at the University of Berlin, and six years later became curator of the royal herbarium. In 1865 he was appointed professor of botany at the University of Bonn and director of the botanical garden. Hanstein is remembered for studies in plant anatomy and morphology. In 1868 he introduced the "histogen theory" to explain shoot apex behaviour in plants.〔(Mutation Breeding ) by A. M. van Harten; (Hanstein's histogen theory)〕 With his close friend, Nathanael Pringsheim (1823-1894), he conducted pioneer research involving the fertilization process in ferns. The plant genus ''Hansteinia'' of the family Acanthaceae is named after him.〔(JSTOR ) New Species of Hansteinia (Acanthaceae) from Colombia〕 ==Gallery== File:Capsella bursa-pastoris, kiembol (Hanstein).jpg|''Capsella bursa-pastoris'' drawing by Johannes von Hanstein File:Asteranthera ovata (3163923562).jpg|''Asteranthera ovata '', (Cav.) Hanst. in the Puyehue National Park 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Johannes von Hanstein」の詳細全文を読む スポンサード リンク
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