• Darwin Archive | 'Power of movement': portfolios, 1862-1882 | Sleep, 1864-01-01 - 1879-09-02 | Oxalis acetosella [fig 155], 1877-10-04 - 1877-10-05 | proof sheet of 'Forms of flowers' p 90 [published pp 177-179], 1877-01-01 - 1882-04-30

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