John and Gerry's    Orchids of Britain and Europe
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Ophrys lutea ssp quarterae
 

O.
lutea ssp quarterae was first named as such and described from the Algarve, Portugal by Kreutz,  Lowe and Wucherpfennig in 2007,  although it had been known for many years from a small number of sites that  were then thought to be outlying populations of O. sicula or possibly even O. battandieri, otherwise from the Tell Atlas of north Africa.

This taxon is rare and known from only two regions in the southern Iberian peninsula, the Algarve of Portugal and Andalucia in southern Spain. In the former area it is largely restricted to the valley of the Ribeira de Quarteira (from where it was first described and named) and in Andalucia in the provinces of Cadiz, Sevilla, Jaen and Malaga.

It grows in relatively small colonies, very often in close association with O. lutea itself. It is however easily separated from this species by virtue of its slender appearance and smaller flower which invariably carries
an inverted "v" extension of the brown central lip area into the yellow margin of the central lobe. This latter feature is also a common characteristic of  O. sicula  and one of the key reasons that O. lutea ssp quarterae  was for long thought to be that species.  It prefers an alkaline soil with conditions very similar to that of O. lutea and despite some authorities asserting that it flowers up to three weeks in advance of O. lutea, we the authors have not found there to be a great deal of difference between the two.  This observation is however based on higher altitude populations above 500m in the province of Malaga and the same situation may not prevail elsewhere in its range.

The pictures come from the Grazalema region of Andalucia, Spain and date from the second week of April.