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What Are the Three Venation Patterns?

[Summary]Leaf Structure and Arrangment Structure of a Typical Leaf Each leaf typically has a leaf blade called the lamina, which is also the widest part of the leaf. Some leaves are attached to the plant stem by a petiole. Leaves that do not have a petiole an

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Leaf Structure and Arrangment

Structure of a Typical Leaf

Each leaf typically has a leaf blade called the lamina, which is also the widest part of the leaf. Some leaves are attached to the plant stem by a petiole. Leaves that do not have a petiole and are directly attached to the plant stem are called sessile leaves. Leaves also have stipules, small green appendages usually found at the base of the petiole. Most leaves have a midrib, which travels the length of the leaf and branches to each side to produce veins of vascular tissue. The edge of the leaf is called the margin .

What is reticulated venation?

Reticulated venation is one of three classifications of vein patterns found in a leaf. In leaves with reticulated venation, veins are interconnected and form a web-like...

Definition of Leaf Venation | Define Leaf Venation

Leaf Venation

RELATED WORDS

Definition of Leaf Venation

Arrangement pattern of the veins of the leaf

More About Leaf Venation

The fine lines present on the leaf are called ‘leaf veins’

The single middle prominent vein is known as ‘mid rib’ or the primary vein

The veins other than the primary vein are called ‘secondary veins’

Floral venation patterns in Siphocampylus (Campanulaceae)

Floral venation pattern

A similar floral venation pattern can be seen among the species investigated. Figures 11–13 show the main venation patterns of the petals; sepals and petals; and sepals, petals, and stamens, respectively. For a better understanding of the discussion that follows, Fig. 13 also shows where the transverse sections cross the hypanthium.

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Tertiary leaf fossils of Mangifera (Anacardiaceae) from Li Basin, Thailand as examples of the utility of leaf marginal venation characters

MATERIALS AND METHODS

The fossil material presented here was collected from Li Basin, one of approximately 40 basins filled with Cenozoic continental sediments scattered throughout northern Thailand (Nichols and Uttamo, 2005). It is located in Li District, Lamphun Province, northern Thailand, at latitude 17°45′ N and longitude 99°00′ E, approximately 600 km north of Bangkok and 150 km south of the city of Chiang Mai (Fig. 1). The basin is elliptical-elongate, orientated in a NNW-SSE direction, and covering an area of 270 km2 with a maximum width of 18 km and maximum length of 21 km (Tantasuparuk, 1991).

Article by Dr. Lanny Neel on Leaves

Simple Leaves

The flat, light-intercepting part of a leaf is called the blade. It may be directly attached to a stem at its base, or, the blade may be attached to the stem by a narrow stalk called a petiole. There is almost always a bud (tiny growing point) found in the angle between the petiole and the stem (leaf axil). A simple leaf (Figure 3) consists of one blade and (usually) a petiole that connects the blade to the stem.

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