• Darwin Archive | 'Cross and self fertilisation': portfolios, 1840s-1876 | 'Cross and self fertilisation': experimental results, continued | 'Cross and self fertilisation': experimental results, continued | Passiflora gracilis / White Thread crossed / Black Thread artificially self-fert / No Thread spontaneously self-fertilised, 1867-01-01 - 1867-12-31 | Passiflora gracilis / White Thread crossed / Black Thread artificially self-fert / No Thread spontaneously self-fertilised, 1867-01-01 - 1867-12-31

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