borne in pairs, enclosed in a protective husk,
and are usually sold husked and separated.
The individual fruits have a characteristic
ridged surface, and their aromatic oil is
contained in canals that lie under the ridges.
Ajwain Ajwain (Trachyspermum ammi) is a
close relative of caraway, used in North
Africa and Asia, especially India, and can be
thought of as a seed version of thyme: it
carries the essence of thyme, thymol, in a
caraway-like seed.
Carrot family anatomy. Fennel seeds. Seeds of
plants in the carrot family carry their
essential oil in hollow chambers beneath their
outer ridges.