Darwin-Hooker Letters : Letter from C. R. Darwin to J. D. Hooker [28 July – 10 August 1861]
Darwin, Charles Robert
Darwin-Hooker Letters
<p style='text-align: justify;'>Puzzled by function of orchids’ rostellum.</p><p style='text-align: justify;'>Orchids’ pollen concentrated in two pollinia; hence one flower can fertilise only two others. This may explain precision of orchid pollination mechanisms.</p>