Artemisia nilagirica is a species native to India and is commonly known as Nilgiri wormwood. It's used in traditional Indian medicine and has a pungent aroma.
Artemisia vulgaris is a more widespread species found in many parts of the world, including Europe, Asia, and North America. It's known as common wormwood or mugwort. It is used in traditional medicine, culinary applications, and even as a natural dye.
While both species belong to the same genus, they have different origins, appearances, and uses.