A change in the pollinator could arise from a change in the flower structure.

The changed plant could then be isolated from its species due to the inability to exchange pollen when the pollinator is different.

Alternatively, the flower could develop the ability to produce seed without pollination or fertilization (apomictic).

Here the Small Duck Orchid, with its labellum covered in shiny calli (see photo above), awaits a specific species of thynnine wasp to arrive. In this case, the labellum structure has changed in shape and possibly no longer attracts any pollinator (see photo above).  The result can be catastrophic but the plant has adapted.  It now uses vegetative reproduction - perhaps until it can attract a new type of pollinator.  This process could result in a new species.
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