These marked flowers were tracked over in order to assess the number of removed pollinia
from anthers, and those deposited on the stigmatic cavities.
Drawing on his theory of natural selection, Darwin predicted that a moth with a proboscis 10-11 inches long must exist, because only such a creature could both reach the nectar and be positioned while doing so to collect or deliver the pollinia
Six specimens were caught with orchid pollinia
attached to the proboscis.
Under the magnification of a dissecting microscope, pollinia
were removed from a donor flower by grasping the corpusculum with small forceps.
Anther (2.5)3 x 1.5-2 mm, yellow, apex truncate, light green; pollinia
two, waxy, sulcate, ca.
Nectar parasitism of Asclepias syriaca by ants: effects on nectar levels, pollinia
insertion, pollinaria removal and pod production.
Pollinarium formed by two obovoid, sulcate pollinia
; stipe narrowly triangular, united to an ovoid viscidium.
We argue that blaming low fruit set on the performance of a discrete lineage of anthophilous insects as poor pollinia
vectors must be approached with caution for two reasons.
In this study, male pollination success was measured as the number of pollinia
removed (0, 1, or 2), whereas female pollination success was measured as the number of pollinia
received (0 or 1).
Nectar parasitism of Asclepias syriaca by ants: effect on nectar levels, pollinia
insertion, pollinaria removal, and pod production.
The evolution of pollinia
, which occurs in the majority of orchids, functions best with specialist pollinators.
are enclosed within the anther as four lobes in two pairs without stipe or viscidia.