Margins and veins
The edge of a leaf and the veins inside it are what a key asks about first. The words for them are Latin participles, and each one hides a consonant that says something other than its letter.
Edge and vein
laciniate
luh-SIN-ee-ut/Cut into deep, narrow, irregular lobes, as though the edge had been slashed rather than toothed. The individual strips are called laciniae.
9 heard spellings on file
emarginate
ee-MAR-jin-ut/Notched at the tip, as though a small bite had been taken out of the end of the blade. Common in clovers and in many woodland herbs.
11 heard spellings on file
reticulate
ri-TIK-yuu-lut/Net-veined. The veins branch and then rejoin, so the blade is covered in closed meshes rather than in lines running to the edge. Almost all broadleaved trees are reticulate.
11 heard spellings on file
Reticulate covers the net of veins in the blade. It is the one word here you will also meet outside botany, in anatomy and in pottery.