Oenothera caespitosa, Tufted Evening Primrose is an uncommon find! Also called the desert evening primrose, rock-rose evening primrose, or fragrant evening primrose, is a perennial plant native to California. It produces a rosette of lobed or toothed leaves. Large white flowers open in the early evening, and are pollinated throughout the night by Sphinx moths. Smells wonderful! Blooming can be prolonged by pinching spent blossoms.
USDA Zones 4a to 10b
Tortoise Safe, keep protected at least first year, they'll eat it to the ground.
Photo credit: Stan Shebs [GFDL (http://www.gnu.org/copyleft/fdl.html), CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0) or CC BY-SA 2.5 (https://creativecommons.org/licenses/by-sa/2.5)], from Wikimedia Commons