• Darwin Archive | 'Cross and self fertilisation': portfolios, 1840s-1876 | 'Cross and self fertilisation': experimental results, [1840s]-1875 | A number of seeds of themselves the second generation of Ipomaea purpurea were sown [with table], 1867-02-27 | A number of seeds of themselves the second generation of Ipomaea purpurea were sown [with table], 1867-02-27

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