What does 'opposite' refer to in plant terminology?

In plant terminology, 'opposite' refers specifically to leaves or bracts that are arranged in pairs at a single node, positioned directly across from each other on the stem. This arrangement contrasts with other patterns such as whorled, where multiple leaves grow around the stem at one node, or alternate, where leaves are staggered along the stem. The opposite leaf arrangement is significant in plant identification and morphology because it influences how light is captured, water is absorbed, and overall plant growth occurs. Recognizing this pattern can help with identifying plant species and understanding their growth habits and ecological roles.