Oh, “greasewood”.
How does that stuff not burn hot?
.
No, not “greasewood.”
That is mostly found in coastal hills.
It also burns hot, but is easy to work through.
Greaswood (creosote) does burn pretty hot, but it is primarily a desert plant and the clumps have a tendency to grow rather far apart.
Not really what you could call Class 14 brush; which consists mostly of Manzanita, Scrub Oak, Poison Oak, Yucca and others.
Different plants in different bioms.