It is made from the dried red stigma of the crocus sativus flower.
en.wikipedia.org In the winter, the anemone, asphodel, brassica, honeysuckle, crocus, and rock rose bloom.
en.wikipedia.org However, the two plants are not closely related, and there is no blue crocus, either in the wild or in cultivation.
en.wikipedia.org Human cultivation of saffron crocus and use of saffron spans more than 3,500 years and spans different cultures, continents, and civilizations, see history of saffron.
en.wikipedia.org Such was his collecting zeal that, by the turn of the 20th century, he was growing over 130 species of colchicum and crocus.
en.wikipedia.org