Cypripedium macranthos Sw.

Kubentayev, Serik A., Efimov, Petr G., Alibekov, Daniyar T., Kupriyanov, Andrey N., Izbastina, Klara S., Khalymbetova, Aizhan E. & Perezhogin, Yuri V., 2023, Review of Orchidaceae of the northern part of Kazakhstan, PhytoKeys 229, pp. 185-213 : 185

Cypripedium macranthos Sw.

Distribution in adjacent reg.

Russia (European Russia, Ural, Siberia), Kazakhstan (Altai).

Specimens examined and literature records.

Tobol-Ishim: North Kazakhstan Region: Kyzylzhar District: on the right shore of Ishim River , 5 km north of Krasnoyarka , 16 Jun 1968, Kolodchenko s.n.. ( АА!, LE!); on right shore of Ishim River , near Krasnoyarka, Jun 1968, Shakarova et al. s.n.. (NKU!); same loc., 27 Jun 1987, Samoylova et al. s.n.. (NKU!).?Kokchetav:? Akmola Region [without detailed locality] ( Semenov 1928; Kusnetsov and Pavlov 1958; Gorchakovskiy 1987). Irtysh: Pavlodar Region [without detailed locality] (Kusnetsov and Pavlov 1958). Semipalatinsk Pinery: East Kazakhstan Region: Beskaragay District : near Kara-Murza, 16 Jun 1956, Olovitikova s.n.. (LE!) .

Habitat and ecology.

Birch forests and valleys of forest streams.

Phenology.

Flowering in Jun; fruiting in Jul-Aug.

Conservation status.

This very rare species is included in the Red Book of Kazakhstan (category II). It is protected within the “Sogrov” and "Floodplain of the Irtysh River" State Nature Reserves.

Notes.

According to recent reports ( Sultangazina et al. 2014; Kupriyanov 2020) and our field studies, there is currently no confirmation of the presence of Cypripedium macranthos within the territory of Kokchetav FR.

One specimen of C. x ventricosum ( C. calceolus × C. macranthos ) hybrid was found: "Tobol-Ishim: North Kazakhstan Region: Kyzylzhar District: on the right shore of the Ishim River, near Krasnoyarka, 17 Jun 1968, Tsykareva s.n.. (AA!)". This species occurs in areas where parent species co-occur, forming transitional populations with intermediate morphology ( Averyanov 1999; Knyazev et al. 2000; Filippov and Andronova 2011; Andronova et al. 2017). This hybrid is reported for the first time in the studied region; Previously it was only reported in the Katon-Karagai District of the East Kazakhstan region in Kazakhstan ( Kotuhov et al. 2009, 2018).