Cryptantha maritima

I've only seen this species at Organ Pipe Cactus National Monument. In the US, it is restricted to extreme SW Arizona and SE California. My identification on this one is also somewhat tentative, as there are a number of very similar Cryptanthas.

Whole plants at the Organ Pipe campground, 2/5/05.

Close view of flowers at the Organ Pipe campground, 2/5/05.