Crocus from Bulb.com  
   Planting and cultivation, varieties, and photograph.
   http://www.bulb.com/springguide98/crocus/

Better Homes and Gardens:Crocus Flowers  
   The early birds in the spring garden! Small, egg-shaped blooms create a blanket of color. Beautiful colors that range from blue and purple to bright yellow will make your garden stand out.
   http://www.bhg.com/home/Crocus-Flowers.html

The Crocus  
   Discussion of different varieties of crocuses and planting considerations, by Brian Baldwin.
   http://gardenline.usask.ca/misc/crocus.html

Saffron  
   The history and culture of saffron, harvested from fall-flowereing crocus sativus.
   http://www.cob.montevallo.edu/macksre/saffronsite.htm