Just starting to flower is Jeffersonia dubia, fun to watch as they emerge, the foliage is beet red and rubbery looking (Photo 1). My plants are from a good dark color form, just opening their first couple blooms... flower color is deeper than what the photo captured. However, I wanted to showcase a form that Darrell Probst collected, CPC 3.10.97 (Cobblewood Plant Collection), selected on account of it's dark flowers (although my normal form are darker) and the red seed pods. In full flower on 04-04-2010, I note some other differences: the ovary is red (green in other dubia forms) and the stamens dark tipped (light color in other dubia forms).
Sun is very strong today, and my daughter's cheap entry-level Nikon Coolpix does a terrible job with white or light-colored flowers, and after several tries, settled on these washed out looking photos, but it is the best I can do. In the last photo, I used a sun baffle to tone down the bright light.