It is the colour more than anything which shows the difference. Also flavissima tends to offset like mad. The seedheads of flavissima are small, much larger for citrina. flavissima has a warmer colour too. Alberto will give you more the scientific differences Jim. Ina Ina Crossley Auckland New Zealand zone 10a On 25/02/2014 10:09 a.m., James SHIELDS wrote: > After looking at the PBS wiki and other places, I wonder how to tell the > difference between Zephyranthes citrina and Z. flavissima? > > Any help will be greatly appreciated. > > Jim >