FIGURE 4.

The major shape variations of the lateral petals. The PC1, PC2, and PC3 scores accounted for 37.6, 14.5, and 7.2% of the total shape variation of lateral petals, respectively. Yellow dots represent landmarks. Red circles represent labeled landmarks. Cyan, green, and red lines represent the lobe contours, tube boundaries, and petal midribs, respectively. The lateral petals are illustrated from top-view (PC1) or side-view (PC2 and PC3) to exhibit the shape variations. The petal forms with mean PC values are illustrated in gray; the petal forms with PC values of mean ± 2 standard deviations are illustrated in beige.