Dudleya pulverulenta, Chalk Dudleya. is a large, distinctive Dudleya.
The grayish, chalky (or farinose) covering that gives the species its common name protects it from temperature extremes. The red flowers are a favorite of hummingbirds when in bloom. It is a cliff-dweller in nature and those attempting to grow the plant in gardens are advised to plant it in a more-or-less perpendicular position, as shown in this photo.
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Photo Credit: ohn Rusk from Berkeley, CA, USA (J20161202-0013—Dudleya pulverulenta—RPBG) [CC BY 2.0 (https://creativecommons.org/licenses/by/2.0)], via Wikimedia CommonsCredit: