With respect to B. praemorsa, however, Mast's results accord closely with the arrangement of Thiele and Ladiges, placing it in a polytomous clade corresponding exactly with Thiele and Ladiges' B. ser. Cyrtostylis.
Mast's results for B. praemorsa match the classification of Thiele and Ladiges, grouping it with their B. ser. Cyrtostylis species in a polytomous clade.