Discocactus petr-halfarii Zachar in Kaktusy (Brno) 44: 45. 2008
Discocactus petr-halfarii in Kaktusy (Brno) 44: 45. 2008
is basionym for Discocactus zehntneri subsp. petr-halfarii in Phytotaxa 207: 209. 2015
is basionym for Discocactus bahiensis subsp. petr-halfarii in Kakteen And. Sukk. 59: 184. 2008
has orthographic variant Discocactus petr-halfari
Discocactus petr-halfarii in Kaktusy (Brno) 44: 45. 2008