Botanical Flower Structure Chart

Quick Answer: The Botanical Flower Structure Chart is a biology wall chart that shows the parts of a typical flower, from pedicel and thalamus through sepals and petals to stamens and pistil, usually in a labelled longitudinal section. Teachers use this flower structure chart to build the vocabulary for describing flowers in morphology lessons.

The Vocabulary of a Flower

Describing a flower accurately is a skill in its own right, and this kind of chart is built for it. A typical layout shows a whole flower and a longitudinal section, often of a china rose (Hibiscus) or mustard flower, labelling the pedicel and the thalamus on which the floral parts sit, the calyx of sepals, the corolla of petals, the androecium of stamens, each a filament and anther, and the gynoecium of carpels, with stigma, style, ovary and ovules.

Beyond naming parts, flower morphology uses terms that describe how the parts are arranged, and a structure chart is often where students first meet them. Symmetry is one: a flower that can be cut into equal halves along several planes is actinomorphic, like mustard, while one with a single plane of symmetry is zygomorphic, like pea. Ovary position is another: hypogynous flowers have a superior ovary with the other parts attached below it, perigynous flowers carry them on a cup-shaped rim level with the ovary, as in rose, and epigynous flowers have an inferior ovary sunk into the thalamus, as in guava and cucumber.

These terms feed into floral formulae and floral diagrams, the shorthand botanists use to record a family’s flower in one line or one circle. Whether a particular edition adds ovary positions or placentation types as extra panels varies, so check that against what your course requires.

Specifications

Applications

• Guiding a flower dissection in which students lay out each whorl on paper and match it to the chart
• Introducing floral formulae and floral diagrams for families such as Brassicaceae, Fabaceae and Solanaceae
• Teaching symmetry and ovary position with real flowers from the school garden
• Building labelled-diagram answers for examinations

Care & Handling

• Keep the flower structure chart visible during dissections but out of reach of wet specimens and blades.
• Avoid sticking tape across the labels; fix the chart at its margins.
• Store it flat or rolled in a tube when the morphology unit ends.

Why Choose LabEquip

Biology teachers and college botany labs buy this chart to support flower dissection practicals, sometimes with the Flower Charts set that goes on to pollination and fertilisation, or with the Fruit Categories Learning Chart, which follows the ovary into fruit. LabEquip lists all three in its Educational Charts range, and orders can be arranged through the contact page.

Frequently Asked Questions

What is the thalamus of a flower?

The thalamus, or receptacle, is the swollen tip of the flower stalk to which all the floral parts are attached. Its shape decides the position of the ovary relative to the other parts, and in some plants, such as apple and strawberry, it later becomes part of the fleshy fruit.

What is the difference between actinomorphic and zygomorphic flowers?

An actinomorphic flower is radially symmetrical: it can be cut into two similar halves through several planes, like mustard or datura. A zygomorphic flower can be halved into mirror images along only one plane, like pea, bean or Salvia.

What does a superior or inferior ovary mean?

In a flower with a superior ovary, the sepals, petals and stamens are attached below the ovary on the thalamus; this is a hypogynous flower. In an inferior ovary the thalamus grows up around the ovary and fuses with it, so the other parts arise above it, making the flower epigynous.

What is a floral formula?

It is a one-line summary of a flower’s structure using symbols: K for calyx, C for corolla, A for androecium and G for gynoecium, each followed by the number of parts, with signs for symmetry, sex, fusion and ovary position. It lets students compare plant families quickly.

What is placentation?

Placentation is the arrangement of ovules inside the ovary. Common types are marginal, along one edge, as in pea; axile, on a central axis in a divided ovary, as in china rose and tomato; parietal, on the ovary wall, as in mustard; and free central, as in Dianthus.

Are all flowers complete?

No. A complete flower has all four whorls: calyx, corolla, androecium and gynoecium. Many flowers lack one or more; papaya and maize, for example, have separate male and female flowers, each missing a whorl. The chart shows a complete, bisexual flower because it displays every part.

Last Updated: September 2026