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. 2013 Dec 22;113(4):629–641. doi: 10.1093/aob/mct295

Fig. 3.

Fig. 3.

Labellum of Pterostylis sanguinea. Letters refer to landmarks used when describing the copulatory behaviour of the pollinator on the flower. A, apex; LS, lower section; US, upper section; C, callus.