Sentence:  Mancha selecto is the world's best saffron: deep-red stamens, as long as the first joint of your thumb, packed and date-stamped. Lesser types, like <WSD>sierra</WSD> saffron, have shorter stamens and a quantity of white and yellow flower parts. 
Meaning of the word marked with <WSD> tags:  A relatively low-quality grade of Spanish saffron.