| Plastid morphogenesis in trichome hair cells from the stem and petiole of tomato plants. |
| Fronds are, strictly speaking, elaborate compound leaves, attached to the stem by a petiole. |
| Leaf length was measured from the tip of the terminal leaflet down to the base of the petiole at the site of attachment to the stem. |
| Leaf, petiole, and internode lengths were measured with a ruler and petiole and internode diameters were measured with digital callipers. |
| The vaginate sheath of Ligularia is observed in the petiole of cauline leaves as well as in that of radical leaves. |
| The downwardly curved petiole twists away from the wind, so its ventral surface points downwind. |
