Where does “alheña” come from?

alheña (Spanish) comes from Old Spanish alhenna, from Arabic حِنَّاء, from Arabic حَنَّأَ.

alheña (Spanish): henna; privet

Definitions

Step	Language	Word	Meaning
1	Old Spanish	alhenna	henna
2	Arabic	حِنَّاء	henna
3	Arabic	حَنَّأَ	—

alheña — Etymology, Origin & Word History | Etymology Explorer