• Darwin Archive | 'Cross and self fertilisation': portfolios, 1840s-1876 | 'Cross and self fertilisation': experimental results, continued | 'Cross and self fertilisation': experimental results, continued | Thunbergia alata The plants early in season produced hardly any pollen, 1867-01-01 - 1869-12-31 | Thunbergia alata The plants early in season produced hardly any pollen, 1867-01-01 - 1869-12-31

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