Answer:
Aa x Aa
Step-by-step explanation:
Using axial is dominant (A) and terminal is recessive (a). For a recessive trait to show up at all, both parents must have at least one recessive character.
You can solve this using a punnett square
Aa x Aa -> (1) AA (2) Aa (1) aa
This gives a 3:1 ratio or 75%/25% ratio of axial to terminal flowers