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Actually most of the brush burning in these fires is Chamise.
It is a severe danger to fire fighters because their turnout gear gets tangled in it, making travel through it a slow process.
And it is oily and burns hot.
Oh, “greasewood”.
How does that stuff not burn hot?
One of my favorite trails on the San Fran Peninsula is the Chamise Trail connecting Rancho San Antonio to Hidden Villa.
Here is a list of the common plants in Chamise Chapparel and Sage Scrub.
Most of the California chapparel and scrub is very resinous, ignites quickly and burns hot. The Wiki article points out that it is natural for these biomes to burn every 10 to 100 years.