Crux

Crocus Link to heading

Crocus is most commonly purple (royal color)
Saffron is in the family of Crocus (Iris)..
as well as turmeric.
Crocus is one of the earliest flowers of Spring.

Krokos is a small Greek town in Western Macedonia.

A similar word is crux. (cross / ankh )
A crux can be 'a problem'
and the crux of a problem is the problems core.