• Darwin Archive | 'Cross and self fertilisation': portfolios, 1840s-1876 | 'Cross and self fertilisation': observations on insects visiting flowers and 'Cross and self fertilisation' experiments, 1840s-1860s | Insect visits and/or cross and self-fertilisation experiments; Dichogamy. | White vars of common Snap-Dragon have narrow yellow tip to entrance, 1873-06-20 | White vars of common Snap-Dragon have narrow yellow tip to entrance, 1873-06-20

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