The following is a list of Orchids that are reported to occur on Dominica based upon the Flora of the Lesser Antilles - Leeward and Windwar Islands by Richard Howard, 1974. Based upon this investigation, there are 70 species of orchids in 31 genera on Dominica.
Epidendrum discoidale is endemic to Dominica.
The best time of year to observe orchids in flower is February.

The above is Epidendrum discoidale, an endemic on Dominica.
Brachionidium sherringii
Brassavola cucullata
Cranichis muscosa
Dichaea hookeri
Dichaea hystricina
Dichaea muricata
Elleanthus longibracteatus
Epidendrum ciliare
Epidendrum cochleatum
Epidendrum dendrobioides
Epidendrum difforme
Epidendrum discoidale
Epidendrum elongatum
Epidendrum fragrans
Epidendrum ibaguense
Epidendrum jamaicense
Epidendrum latifolium
Epidendrum miserrimum
Epidendrum nocturnum
Epidendrum pallidiflorum
Epidendrum ramosum
Epidendrum rigidum
Epidendrum secundum
Epidendrum strobiliferum
Epidendrum vincetinum
Erythrodes hirtella
Erythrodes plantaginea
Eulophia alata
Habenaria alata
Habenaria monorrhiza
Isochilus linearis
Jacquiniella globosa
Leochilus labiatus
Lepanthes aurea
Liparis nervosa
Malaxis major
Malaxia massonii
Malaxis umbelliflora
Maxillaria coccinea
Maxillaria inflexa
Octomeria graminifolia
Oncidium altissimum
Oncidium picturatum
Oncidium wydleri
Pleurothallis aristata
Pleurothallis imraei
Pleurothallis ophioglossoides
Pleurothallis pruinosa
Pleurothallis ruscifolia
Polystachya concrreta
Ponthieva petiolata
Ponthieva racemosa
Prescottia oligantha
Prescottia stachyodes
Psilochilus macrophyllus
Scaphyglottis modesta
Spiranthes cranichoides
Spiranthes elata
Spiranthes lanceolata
Spiranthes torta
Stelis perpusilliflora
Stelis pygmaea
Stelis scabrida
Tolumnia urophylla
Triphora surinamensis
Vanilla hartii
Vanilla mexicana
Vanilla planifolia
Vanilla pompona
Wullschlaegelia aphylla