Orchids

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The difference between the Pollinia is the reliable way to distinguish between these two species.

A pollinium is a coherent mass of pollen which is produced by one another and is transferred as a single unit during pollination.

Pollinia in the Greater Butterfly Orchid (diverging)

Wiki Commons - Gail Hampshire

Pollinia in Lesser Butterfly Orchid (parallel)

Wiki Commons - Hans Hillewaert