title: On the natural interspecific hybrids of Ophrys mammosa Desf. s. l. and O. oestrifera M. Bieb. (Orchidaceae) from the Crimea and the North Caucasus
abstract: Two natural interspecific hybrids of Ophrys mammosa Desf. s. l. and O. oestrifera M. Bieb. (O. × aghemanii Renz) are reported from Russia: a very rare O. mammosa subsp. mammosa × O. oestrifera from the Crimea (vicinity of Zelenogorye) and a relatively abundant O. mammosa subsp. caucasica (Woronow ex Grossh.) Soó × O. oestriferafrom the Krasnodar Territory (vicinity of Bolshoy Utrish). Males of Andrena carantonica Pérez are recorded as efficient pollinators of apparently both O. mammosa subsp. ca
journal: Turczaninowia