it is used to purge parasites
It is Tree Tobacco (Nicotiana Glauca)
The scientific or taxonomic name would be Nicotiana glauca.
If your question pertains to the species of Nicotiana which are safe to smoke, there are multiple including Nicotiana Tabacum and Nicotiana Rustica - the two most commonly smoked in North America. Nicotiana Rustica has a very large nicotine content (Upwards of 13%). Nicotiana Sylvestris is mixed with Rustica to lower the potency. Nicotiana Tabacum is mass produced by cigarette companies all over the world. More exotic species include Nicotiana Persica, Nicotiana Glauca (Brazillian tree tobacco), and many more. The ornamental Nicotiana x sandrae and Saratoga Mix flowers that you can buy are generally not the best to smoke, however not poisonous. Other Nicotiana plants than these are exotic, and while not much testing has been done to see if they contain poisons, one should approach with caution if the intention is to ingest. Nicotine, however, itself is a neurotoxin to many animals and insects, and it's effects on humans are well known.
The root of the plant is used medicinally, and tea is sometimes made from the leaves. Chinese herbalists consider roots older than three years to be the most effective medicinally.
medicinally and as a flavoring for beverages
Ginkgo leaves, fresh or dry, and seeds, separated from the outer layer of the fruit, are used medicinally.
Stypandra glauca was created in 1810.
Simarouba glauca was created in 1811.
Deltote glauca was created in 1910.
The root of the plant is used medicinally, particularly in China, where traditional Chinese medicine places a high value on it.
Nicotiana quadrivalvis was created in 1814.
C. yanhusuo: the rhizome (underground stem) is used in healing. C. cava: the tubers (knobby, fleshy underground stems) are used medicinally.