The arrangement of flowers on the floral axis is termed an inflorescence.
A kind of inflorescence in which the flowers are aligned in a seeming whorl, comprising a pair of opposite axillary, generally sessile cymes is verticillaster inflorescence.
A verticillaster refers to a fascicle with the composition of a dichasium, it is a common feature among the members of the Lamiaceae family.
Lamiaceae is a family of flowering plants generally known as the sage or mint family.
Some examples are basil, mint, rosemary, lavender, etc.
Ocimum is the genus of aromatic perennial and annual herbs and shrubs in the family of Lamiaceae.
It is also known as tulsi or holy basil.
Thus, the inflorescence commonly found in basil or Ocimum is verticillaster inflorescence.