Where does “subrubens” come from?

subrubens (Latin) comes from Latin subrubeo, from Latin rubeō, from Proto-Italic ruðēō, from Proto-Indo-European h₁rudʰéh₁ti, from Proto-Indo-European h₁rewdʰ- — red.

Definitions

Ancestry of “subrubens”, step by step

Step	Language	Word	Meaning
1	Latin	subrubeo	I am reddish, become reddish; blush
2	Latin	rubeō	—
3	Proto-Italic	ruðēō	—
4	Proto-Indo-European	h₁rudʰéh₁ti	to be red
5	Proto-Indo-European	h₁rewdʰ-	red

Every word from Proto-Indo-European h₁rewdʰ- →

subrubens — Etymology, Origin & Word History | Etymology Explorer