• 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. | It is remarkable that some flowers which absolutely require insect agency or almost absolutely require it should be annuals, 1809-01-01 - 1882-04-30

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