Red and green, but not a poinsettia

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I was out hiking the desert on December 25 when these red and green Christmas colors sparked my interest.
A lone eucalyptus tree, in an eye-catching stage!

You can enlarge this photo a lot and enjoy the pretty opercula.
I'm just learning this botany vocabulary and what fun to discover that eucalypt comes from the  Greek for "well covered," just like we can see in the photo!

Wikipedia explains

Eucalyptus is one of three similar genera that are commonly referred to as "eucalypts" . . . Many species, but far from all, are known as gum trees because they exude copious kino from any break in the bark (e.g. scribbly gum).
The generic name is derived from the Greek words ευ (eu) "well" and καλύπτω (kalýpto) "to cover," referring to the operculum on the calyx that initially conceals the flower.

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