• Darwin Archive | 'Cross and self fertilisation': portfolios, 1840s-1876 | 'Cross and self fertilisation': experimental results, continued | 'Cross and self fertilisation': experimental results, continued | Viola tricolor / Three plants, very similar, seedlings, large-flowered, purple and yellow, 1870-12-31 | Viola tricolor / Three plants, very similar, seedlings, large-flowered, purple and yellow, 1867-01-01 - 1870-12-31

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