At leaf vein angles - galls located exclusively in the inside of the intersection between the lateral veins and main veins of the leaf.
Between leaf veins - galls are not specifically located only on leaf veins. Galls with this term may sometimes incidentally appear close to veins.
Bud - galls are located in buds (often found where branches intersect the stem, can be mistaken for stem galls).
Flower - galls are located in flowers. Note this is a botanical term referring to reproductive structures, and some flowers (eg oak catkins) may not be obviously recognizable as such.
Fruit - galls are located in fruit. This is a botanical term referring to seed-bearing structures, and some fruit (eg maple samaras) may not be obviously recognizable as such.
Leaf midrib - galls are located exclusively on the thickest, central vein of the leaf.
Lower leaf - galls are located on the lower (abaxial) side of the leaf.
On leaf veins - galls are located exclusively on or very close to the veins of the leaf, including but not limited to the midrib.
Petiole - galls are located on the part of the midrib between the leaf and the stem.
Root - galls are located on the roots of the plant or near the base of the stem.
Stem - galls are located anywhere in or on the stem (except within buds, which are occasionally deformed by gall inducers enough to appear as stem galls).
Upper leaf - galls are located on the upper (adaxial) side of the leaf.
Leaf edge - galls are exclusively located around the edge of the leaf, often curled or folded.