John and Gerry's    Orchids of Britain and Europe
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Ophrys promontorii 

  This Italian endemic is a member of the small O. lunulata  group which was first described from Foggia
  by  Danesch and Danesch  in  1971.   Its name refers to the  promontory of  Mount Gargano  where this
  species is at its  most frequent,  although it should be stressed that nowhere within its range is at all a
  common orchid.

  O. promontorii  has a  central peninsula Italian distribution  and may be encountered from the Abruzzi
  region in the north,  down through the eastern provinces to Brindisi in the south.  As already mentioned,
  its  headquarters  is  firmly  the  Gargano  peninsula  where it prefers short grassland and meadows on
  alkaline substrates up to approx 1300m.

  This is a relatively stable Ophrys  although an  enthusiastic  hybridizer  with  several  recognized  and
  named forms IE :- O. promontorii x O. bertoloniformis  =  O. azurea ;  O. promontorii x O. incubacea =
  O. angelensis .  There is considerable expert debate as to the origins of this species and whilst Delforge
  doubts any hybrid heritage,  many others are completely convinced of  this. The precise identity of the       contributing species is however a matter of some disagreement with O. incubacea,  O. lunulata and even
  O. garganica  being suspected. 

 
Notwithstanding  hybrids, O. promontorii is not easily confused with other species and will generally           present several stable features.  It is invariably green sepalled and hirsuit with basal swellings that
  are hairless on the inner face. The speculum can however vary from a full glossy blue shield to a loose
  H formation and most commonly,  two or more isolated dots or streaks. 

The following oddities are hybrids. The first with O. garganica and the second and third are an unlikely cross with O. apulica.