Dymondia margaretae (Introduced- USA)

Dymondia margaretae Compton, J. S. African Bot. 19: 110 (1953);
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Cape Prov. as per POWO;
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Dymondia margaretae from California-GS01052023-1: 4 high res. images.
Dymondia margaretae Compton
The genus with only one species is Endemic to Cape Province Region of South Africa, cultivated elsewhere as ground cover and a lawn replacement often used as filler for step stones, pavers and other small pieces of land and hill slopes, also known as living cement., with linear leaves with white edges and yellow heads.
Photographed from Fremont, California.

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References:
POWO  Catalogue of Life
https://pza.sanbi.org/dymondia-margaretae
https://waterwisegardenplanner.org/plants/dymondia-margaretae/
https://en.wikipedia.org/wiki/Dymondia