Pollination requirements of fruits and nuts

The different forms of flowers on plants of the same species

Charles Darwin

1877

The effects of cross and self fertilisation in the vegetable kingdom

Charles Darwin

1876

The natural history of pollination

Peter Yeo, Michael C. F. Proctor, Michael Proctor et al.

1996

The various contrivances by which orchids are fertilised by insects

Charles Darwin

1877

Pollination Biology

Leslie Real

1983

Flowers

Melanie Waldron

2014