• Darwin Archive | 'Forms of flowers' portfolios and relate journal articles, 1841 - 1877 | 'Forms of flowers': notes, 1862-1867 | Seedlings from Cowslip-Polyanthus crossed in 1861, 1863-03-07 - 1863-03-24 | Seedlings from Cowslip-Polyanthus crossed in 1861, 1863-03-07 - 1863-03-24

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Part of the Cambridge University Library Repository