John and Gerry's    Orchids of Britain and Europe
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Ophrys insectifera f luteomarginata

insectifera was first described from Oland, Sweden in 1753 and is a familiar Ophrys to most botanists who may refer to it by its common name of Fly Orchid.

This is a species that leaving aside numerous intermediates that arise from hybridization, shows little significant variation throughout its range.  It is notable as being the most northerly species of Ophrys in Europe and may be found, albeit rarely in Scandinavia and central Russia.  It is however,  primarily a mid European orchid, being found in suitable habitat throughout central Europe as far south as Spain and Greece.  It can be abundant in its favoured locations, where although it will tolerate a position in full sun, it very much prefers the semi shade of hedge banks and light woodland. O. insectifera usually selects dry alkaline conditions but is also known from acid wetlands and at a site in North Wales, it grows on the tussocks of bog rush protruding from the surrounding fen.
Despite its huge distribution and undemanding habitat conditions, it is remarkably stable and the only variation noted with any regularity is the form named luteomarginata which can occur (rarely) throughout the range of the type species. This variation differs from O. insectifera by the colour of the lower lip margin,  which instead of the normal brown, is yellow. In the UK it was formally identified and described by Les Lewis in 2006 and this study put paid to rumours of the existence in the UK of the continental yellow Fly Orchid species, O. subinsectifera or O. aymoninii.  

O. insectifera f luteomarginata is a rare orchid, known from just a few sites in the UK, primarily in the south of England but also a well known site in Anglesey, Wales.  The pictures date from the end of May.