You mention (“Different Forms of Flowers”, page 331), the deficiency of glands on the calyx of the cleistogamic flowers of several Malpighiaceæ, suggesting, in accordance with Kerner's views ...
Farrer in your journal some years ago, in which parts of the flowers have been greatly modified, so that bees may act as fertilisers while sucking the secretion on the outside of the calyx.
Moths study key to 200-year-long nature project Pollination threatened ... "Some of them happen to be visiting flowers and can be an important part of the pollination process." ...