Variation of staminodes: a, b represent variation of the depth of staminode lobes in population of Kangding, Sichuan c represents variation of the depth of staminode lobes in population of Baoxing, Sichuan (the type locality of Parnassia leptophylla) d represents variation of the depth of staminode lobes in population of Cangshan, Dali (the type locality of P. delavayi) e represents variation of the depth of staminode lobes in population of Mabian, Sichuan. Scale bar: 1 mm.