W3 - Simple & Compound Leaves Flashcards
What is the lamina (blade) of a leaf?
The main flat surface of the leaf.
What is the petiole?
The leaf stalk attaching the lamina to the stem.
What is an axillary bud?
A growth point found in the axil between the petiole and stem.
What is the base of a leaf?
The lower third of the leaf shape.
What is the apex of a leaf?
The upper third of the leaf shape.
What is the margin of a leaf?
The edge of the leaf blade (lamina).
What is the midrib/main vein?
The central main vein of the leaf (that runs from the petiole to the apex of the leaf).
What are lateral veins?
Veins radiating from the main vein forming a network in a reticulate leaf.
What is the rachis in a compound leaf?
The main axis extending from the petiole to the end of leaflets. The rachis is the main axis of a compound leaf extending from the petiole to the end of the leaflets - the ‘stalk’ to which the leaflets are attached. It is equivalent to the main vein in the simple leaf.
What are leaflets?
Smaller leaf-like structures along the rachis.
When looking at a Compound Leaf, what is a petiolule?
The stalk of individual leaflets that attaches to the rachis. A Compound leaf still has a petiole which attaches the base of the compound leaf to the stem). The stalk of a leaflet is called a petiolule.
What is a terminal leaflet?
The leaflet at the apex of the compound leaf structure.
What is the petiole in a compound leaf?
The main stalk attaching the whole leaf to the stem.
What is an axillary bud in a compound leaf?
Located in the axil between the petiole and stem.
What does it mean for a leaf to be sessile?
A leaf is considered ‘sessile’ if it lacks a petiole and attaches directly to the stem.
