#Id: 10728
#XL - R Botany
Phyllotaxy
This is usually are of four types – alternate, opposite, spiral and whorled
In alternate type of phyllotaxy, a single leaf arises at each node in alternate manner, as in china rose, mustard and sunflower plants
Phyllotaxy
In opposite type, a pair of leaves arise at each node and lie opposite to each other as in Calotropis and guava plants.
If more than two leaves arise at a node and form a whorl, it is called whorled, as in Alstonia (Devil Tree) Apocynaceae
Spiral phyllotaxy
Fibonacci sequence
Golden Angle
the divergence angle between successively arising leaves is fixed at the golden angle of 137.5°
