Here is a general example of Summoner's AoE.

Macro for Ground AoEs:

/micon "Shadow Flare"
/ac "Shadow Flare" <t>
/ac "Shadow Flare"

Break Down of Macro:

/micon "Shadow Flare" ---> This line is to add the icon of the action.
/ac "Shadow Flare" <t> ---> This line places Shadow Flare on the current target.
/ac "Shadow Flare" ---> If no target is selected, then this line will freely let you place down the ground AoE.

Hope this helps!