• 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. | In Spartium or common Broom the curling manner of the pistil which burst open to keel covers it with pollen so that insects apparently not in least necessary, 1858-05-10

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