Crocus sativus and Crocus

Crocus sativus noun - Old World crocus having purple or white flowers with aromatic pungent orange stigmas used in flavoring food.

Crocus and Crocus sativus are semantically related. In some cases you can use "Crocus" instead a noun phrase "Crocus sativus".

Crocus noun - Any of numerous low-growing plants of the genus Crocus having slender grasslike leaves and white or yellow or purple flowers; native chiefly to the Mediterranean region but widely cultivated.

Crocus sativus and crocus are semantically related. Sometimes you can replace phrase "Crocus sativus" with "Crocus", this terms are similar.