• Darwin Archive | 'Life and letters of Charles Darwin' material and notes on plant variation, 1841 - 1852, 1887 - 1902 | Notes on plant variation and abortive parts, 1841 - 1852 | Clarkia pulchella / Showing naturally abortive stamens, 1841-07-01 - 1841-07-31

• Access on Cambridge Digital Library

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