Macrosiphonia brachysiphon

A primarily Mexican species peripheral in the United States. It enters the U.S. in southeastern Arizona and extreme southwestern New Mexico. I've only seen it flowering at night, but that may have just been bad luck.

A flower near the road between Portal and Paradise on the northeastern side of the Chiricahua Mountains, 2 Sep 2007.

Side view of a flower on the northeastern side of the Chiricahuas, 2 Sep 2007.