Some Indian recipes, books, etc refer to Ajowan (carom) seeds as Lovage. This mistake is quite common, but nevertheless it is INCORRECT.
As SS says, Ajowan seeds are thyme-like (also caraway). In fact they are often used as a substitute for thyme. Native to South India, the ajowan plant looks like wild parsley and is used only for it's seeds.
Lovage (a herb) is totally different to Ajowan.
The plant "Levisticum Officinale" from the Mediterranean (but grows well in UK), is a sturdy perennial with cluster of green-yellow flowers in early Summer which change into ribbed seeds.
Either the plant or the seeds can be used as they both have the same flavour (seeds a little sweeter). Seeds (tastes like celery) are used to flavour liqueurs and as a basic ingredient in the perfume industry. In the kitchen seeds are mainly used to spice up soups, salads, rice and potatoes.
Both Ajowan seeds and Lovage seeds have stripes.
SnS ;D