Tilney, Patricia May; Van Wyk, Abraham Erasmus (Braam); Van der Merwe, Christiaan F.; Wang, Tai
(Public Library of Science, 2014-05-07)
Secondary pollen presentation is a well-known phenomenon in the Rubiaceae with particularly conspicuous pollen
presenters occurring in the tribe Vanguerieae. These knob-like structures are formed by a modification of the ...