Question:
Which Phyllotaxy is seen in Alstonia?
Which Phyllotaxy is seen in Alstonia?
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Whorled phyllotaxy occurs when more than two leaves arise from a single node; it is characteristic of plants like Alstonia and Nerium.
Updated On: Jun 19, 2026
- Alternate
- Opposite
- Whorled
- Opposite decussate
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The Correct Option is C
Solution and Explanation
Step 1: Understanding Phyllotaxy.
Phyllotaxy refers to the arrangement of leaves on the stem or branch of a plant.
There are four main types:
- Alternate: One leaf per node, alternate on opposite sides.
- Opposite: Two leaves per node directly opposite each other.
- Whorled: More than two leaves per node arranged in a circle (whorl).
- Opposite decussate: Pairs of leaves at right angles to the pair above/below.
Step 2: Characteristics of Alstonia.
Alstonia is a medicinal plant in the family Apocynaceae.
Its leaves are arranged in a whorled pattern, with several leaves emerging from a single node around the stem.
This arrangement allows maximum light capture and efficient space usage on the stem.
Step 3: Analysis of other options.
- Alternate: Found in plants like sunflower and mustard. Not seen in Alstonia.
- Opposite: Seen in guava, guava leaves arise in pairs. Not applicable.
- Opposite decussate: Seen in Calotropis.
Step 4: Conclusion.
Hence, the phyllotaxy observed in Alstonia is Whorled.
Phyllotaxy refers to the arrangement of leaves on the stem or branch of a plant.
There are four main types:
- Alternate: One leaf per node, alternate on opposite sides.
- Opposite: Two leaves per node directly opposite each other.
- Whorled: More than two leaves per node arranged in a circle (whorl).
- Opposite decussate: Pairs of leaves at right angles to the pair above/below.
Step 2: Characteristics of Alstonia.
Alstonia is a medicinal plant in the family Apocynaceae.
Its leaves are arranged in a whorled pattern, with several leaves emerging from a single node around the stem.
This arrangement allows maximum light capture and efficient space usage on the stem.
Step 3: Analysis of other options.
- Alternate: Found in plants like sunflower and mustard. Not seen in Alstonia.
- Opposite: Seen in guava, guava leaves arise in pairs. Not applicable.
- Opposite decussate: Seen in Calotropis.
Step 4: Conclusion.
Hence, the phyllotaxy observed in Alstonia is Whorled.
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