Table 1.

General overview on the three species studied.

Botanic Name	Lavandula angustifolia Mill.	Salvia officinalis L.	Ocimum basilicum L.
Common name	lavender	sage	basil
Origin/native range of the species	mountainous regions of the Mediterranean [19]	Middle East and Mediterranean [20]	tropical regions of the Old World [21,22]
Structures containing/ accumulating EO	capitate and peltate trichomes [23]	capitate, peltate trichomes [24,25] and ambrate resinous droplets [25]	capitate and peltate trichomes [26]
Location of highest abundance in EO storage structures	flower calyx [8,23,27]	both sides of the leaf [17,25]	abaxial leaf surface [28]
Harvested plant part and optimal time for EO extraction	inflorescence/upper plant part at full flowering stage [23,27] after midday [29]	leaves and shoots at full flowering, in the evening [30]	herbs at bud flowering stage [31]