Measurement scheme of a 2-lobed stigma of Orobanche. A–I bottom view J, K front view A the length of 2-lobed stigma (µm) A1, A2 the length of single lobes (µm) B the length of upper separation in the middle part between lobes (µm) C the length of lower separation in the middle part between lobes (µm) D the length of the mouth of the stylar canal (slit) (µm) E1, E2 the width of single lobes (µm) F the width in the middle part of the stigma (µm) G the area of 2-lobed stigma (µm2) G1, G2 the area of single lobes (µm2) H the angle between 2-lobed stigma in the upper part (°) I the angle between 2-lobed stigma in the lower part (°) J the length of 2-lobed stigma (µm) K the area of 2-lobed stigma (µm2).