Crassula and Selinum, are different types of what?
Crassula Crassula is a genus of succulent plants containing about 1480 accepted species, including the popular jade plant ("Crassula ovata"). They are native to many parts of the globe, but cultivated varieties originate almost exclusively from species from the Eastern Cape of South Africa.
Selinene Selinenes are a group of closely related isomeric chemical compounds which are classified as sesquiterpenes. The selinenes all have the molecular formula CH and they have been isolated from a variety of plant sources. α-Selinene and β-selinene are the most common and are two of the principal components of the oil from celery seeds. γ-Selinene and δ-selinene are less common.