I love fresh flowers, but my absolute favorites are ranunculus. They are only available during the March-April timeframe, and every year I order them for myself or search the flower shops for them. The picture is of the latest bouquet on my desk I ordered this week.
I discovered them the first time when I lived in San Francisco in one of the amazing flower markets downtown there. I saw them and absolutely loved them and asked the man in the market what they were. That was in 1999 and I have been getting them ever since.
Click here for a nice website with some great pictures and details.