Inflorescence: Racemose and Cymose
Study of the arrangement of flowers on the floral axis, differentiating between racemose and cymose types with examples.
What is Inflorescence: Racemose and Cymose?
A group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches.
Key points
- Define inflorescence and its types.
- Differentiate between racemose and cymose inflorescences.
- Identify the mode of growth of the floral axis.
- Recognize the order of flower opening in each type.
Common exam trap
Confusing acropetal and basipetal succession.
Definitions
- Term
Inflorescence
- Meaning
A group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches.
- Term
Peduncle
- Meaning
The stalk of an inflorescence.
- Term
Pedicel
- Meaning
The stalk of an individual flower within an inflorescence.
- Term
Acropetal Succession
- Meaning
Development and opening of flowers from the base towards the apex.
- Term
Basipetal Succession
- Meaning
Development and opening of flowers from the apex towards the base.
- Term
Determinate Axis
- Meaning
A floral axis that terminates in a flower, thus having limited growth.
- Term
Indeterminate Axis
- Meaning
A floral axis that does not terminate in a flower and continues to grow, thus having unlimited growth.
Learning objectives
Define inflorescence and its types.
Differentiate between racemose and cymose inflorescences.
Identify the mode of growth of the floral axis.
Recognize the order of flower opening in each type.
Provide examples for each type of inflorescence.
Prerequisites
Basic plant morphology (stem, axis, apex).
Understanding of flower structure.
Concept of growth (determinate vs. indeterminate).
Common mistakes
Confusing acropetal and basipetal succession.
Misidentifying the main axis as determinate or indeterminate.
Incorrectly classifying examples of racemose and cymose types.
Overlooking the termination of the main axis in cymose inflorescence.
Keywords
Inflorescence
Racemose
Cymose
Floral axis
Peduncle
Pedicel
Acropetal succession
Basipetal succession
Determinate growth
Indeterminate growth
Flower arrangement
Practice preview
Which of the following is a characteristic feature of a racemose inflorescence?…
easy
Identify the type of inflorescence where the main axis terminates in a flower, and the development of flowers is in basipetal order.…
easy
In a cymose inflorescence, the sequence of flower opening is typically:…
medium