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Compound leaves may be pinnate with pinnae (leaflets) on both sides of a rachis (axis), or may be palmate with multiple leaflets arising from a single point. [1] Leaf structure is described by several terms that include: Bipinnate leaf anatomy with labels showing alternative usages A ternate compound leaf with a petiole but no rachis (or rachillae)
Some apply it to the leaflets of a pinna, especially the leaflets of bipinnate or tripinnate leaves. [7] Others also or alternatively apply it to second or third order divisions of a bipinnate or tripinnate leaf. [8] It is the ultimate free division (or leaflet) of a compound leaf, or a pinnate subdivision of a multipinnate leaf.
The primary leaf or leaves of a plant embryo which upon germination develops into the seed-leaf or the first set of leaves. craspedodromous Pinnate venation in which the secondary veins terminate at the margin s, often as teeth. crateriform In the shape of a saucer or shallow cup; hemispherical or more shallow. cremnophyte
The two main classes of compound leaf morphology are palmate and pinnate. For example, a hemp plant has palmate compound leaves, whereas some species of Acacia have pinnate leaves. The ultimate free division (or leaflet) of a compound leaf, or a pinnate subdivision of a multipinnate leaf is called a pinnule or pinnula.
The leaves are bipinnate or are modified to vertically oriented phyllodes. A few have cladodes rather than leaves. [38] Extrafloral nectaries may be present on the petiole and rachis, and the pinnule tips may carry protein-lipid Beltian bodies. [37] The leaflets are usually opposite, and are carried on shortly stalks or are sessile.
Banksia bipinnatifida is a prostrate shrub with a lignotuber, an underground stem and only a few above-ground leaves. The leaves are bipinnatipartite, meaning that they are deeply lobed, the lobes themselves lobed, giving the impression of a bipinnate leaf. Each leaf is 70–330 mm (2.8–13.0 in) long and 30–70 mm (1.2–2.8 in) wide in ...
Archidendron vaillantii is a tree growing up to 25 m (82 ft) high and a DBH up to 30 cm (12 in). [5] [6] The large evenly bipinnate leaves are around 60 cm (24 in) wide and long with usually 2 pairs of leaflets or pinnae, which in turn are further divided into 2-4 pairs of subleaflets or pinnules (see Gallery).
The alternate leaves are bipinnate compound, 15–40 cm (5.91–15.75 in) long and 17 cm (6.69 in) broad with a 2–6 cm (0.79–2.36 in) petiole bearing four to 15 pairs of pinnae, each pinna with 40–70 leaflets; the leaflets are slender, oblong, 8–15 mm (0.315–0.591 in) long by 2–4 mm (0.079–0.157 in) wide. Near its base, the twiggy ...