The Group (Orchidaceae): An Overview of Recent Taxonomic Changes, with an Updated List of Currently Accepted Taxa.

The (L.) Crantz group is one of the most taxonomically challenging species complexes within the genus . Because of the exceptionally high levels of morphological variability and the ability to readily cross with other species, ninety different taxa at various taxonomic ranks have already been described within its nominative subspecies, but the taxonomic status of most of them is uncertain, widely disputed, and sometimes even irrelevant. The present review is based on results of the most recent research devoted to the . group taxonomy. In addition, we analysed data about taxa belonging to this group presented in some research articles and monographs devoted directly to the genus or to orchids in certain area(s). Based on the reviewed literature and data collected in four taxonomic databases available online, we propose an updated list of the 10 currently accepted taxa in the . group (two species, six subspecies, and two varieties), which includes . (L.) Crantz subsp. ; . subsp. (Robatsch) Kreutz; . subsp. (Arv.-Touv.) R.Engel and P.Quentin; . subsp. (Verm.) Buttler; . var. (Schltr.) S.C.Chen and G.H.Zhu; . subsp. (Pau) E.Klein; . subsp. (Robatsch) Jakubska-Busse, Żołubak, and Łobas, stat. nov.; . Boiss. ex D.P.Young; . var. (Akhalk., H.Baumann, R.Lorenz, and Mosul.) Popovich; and . C.Brullo, D'Emerico, and Pulv.