Narcissus bulbocodium ssp obesus
Pictured growing wild in Portugal - March 2009.
This plant is available for gardeners as "Hoop-Petticoat Daffodil".
It's good for rockeries and scree gardens because it is low growing and tolerates very dry soils.
The plant is about four inches tall.
Taken on a very windy day - which explains the slight movement in the picture.