septuple

He went from 3 under to 4 over, producing a septuple bogey — scoring a 10 on the hole.

The name septuple, sometimes applied to this system, refers to the fact that the number of trees in each group-unit is seven.

Multiplicative; Single or alone, double or twofold, triple or threefold, quadruple or fourfold, quintuple or fivefold, sextuple or sixfold, septuple or sevenfold, octuple or eightfold, &c.

He tapped in — mercifully — to finish the 12th with a septuple bogey.

Equilateral triangle system refers to the planting of the trees in equilateral triangles, but is identical with the hexagonal or septuple.