Epipactis tremolsii is a species of terrestrial orchid of the genus Epipactis

Epipactis

Epipactis, or Helleborine, is a genus of terrestrial orchids consisting of approximately 70 species. This genus is abbreviated as Epcts in horticultural trade.They occur in temperate and subtropical climates of America, Asia, and Europe...

, belonging to the family Orchidaceae. It is confined to the western Mediterranean region where it grows in open mixed oak, cork oak

Cork Oak

Quercus suber, commonly called the Cork Oak, is a medium-sized, evergreen oak tree in the section Quercus sect. Cerris. It is the primary source of cork for wine bottle stoppers and other uses, such as cork flooring. It is native to southwest Europe and northwest Africa.It grows to up to 20 m,...

 and pine woodland. In Portugal in the Algarve region, it flowers rather earlier than Epipactis helleborine

Epipactis helleborine

Epipactis helleborine is a European orchid that has been introduced to several regions of North America. Its nodding flowers vary from greenish pink to purple, and it prefers shaded woodland environments. More information on this species and others of the genus are at Epipactis.-External links:*...

and can be found from April onwards – earlier in an early spring.