Musa Aman's Calanthe 
Mustache Cyrtochilum 
Mycaranthes magnicallosa 
Mycaranthes major 
Myoxanthus monophyllus 
Myoxanthus xiphion 
Myrmecophila christinae 
Nabaluia clemensii 
Narrow-leaved Helleborine 
Narrow-lipped Spider-orchid 
Nodding Greenhood 
Nodding Ladies' Tresses 
Northern Green Orchid 
Northern marsh orchid 
Northern pencil orchid 
Northwestern twayblade 
Oberonia disticha 
Oberonia recurva 
October lady's tresses 
Odd-leaved orchid 
Odontoglossum aurarium 
Odontoglossum luteopurpureum 
Odontoglossum multistellare 
Odontoglossum tigroides