|Catharanthus roseus:image in public domain from biolib.cz|
Vinca rosea or Madagascar periwinkle is an ornamental plant and is used in folklore medicine.
The other Indian names are
Vincristine and Vinblastine are the most important substances extracted from this plant which is used for treating some lymphomas and leukamia and some types of tumors and cancers .The yeild is extremely low ( 1 tonne of the leaves giving less than 50 gm of the usable form of the medicine).
It is used mainly as a tranquilizer and for diabetes and a good herb to reduce high B.P in traditional medicine.But an expert guidance is required because using this plant as a medicine can have unpleasant side effects.