'Mal-' is not usually found as a stem. More frequently, it is a prefix. It comes from Latin and means 'Bad'.
mal, male, bad, badly, velens:to want
math stem
It means bad (example: maladjusted.)
heat
It is Auxin
The stem is the body of a plant that rises above the ground. Stem also means to be caused by.
To speak aloud
Its a woody plant
gago
wash/ to clean
love
Referring to herbaceous plants