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Placentae of Melandrium album excised from ovaries of unopened flowers were pollinated in vitro with pollen grains of Lychnis coronaria. Pollen grains germinated, and pollen tubes were found entering the micropyles 18 h after pollination. Double fertilization occurred. Immature and mature hybrid embryos at different stages of development were analyzed up to the third week of culture. Twenty-five days...
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