Fig. 2

The developmental process of capitulum morphogenesis in C. vestitum. A The different developmental stages of the CVW capitulum. B The different developmental stages of the CVT capitulum. a1-t1 The capitula showed with paraffin section under optical microscope, scale bar = 500 μm at stage 1–10. a2-t2 The capitula under scanning electron microscope, scale bar = 200 μm at stage 1–7 and scale bar = 500 μm at stage 8–10. SAM: shoot apical meristem, IM: inflorescence shoot apical meristem, YL: young leaf, BP: bracts primordia, DFP: disc floret primordia, RFP: ray floret primordia, Br: bracts, PPD: petal primordia of disc floret, PPR: petal primordia of ray floret, DF: disc floret, RF: ray floret, Pe: petal