What classification is used to describe a combination of two or more basic stem placement types?

The term that best describes a combination of two or more basic stem placement types is "Integrated." This classification is used to illustrate how different floral design techniques can be combined to create a cohesive and aesthetically pleasing arrangement. Integration implies a harmonious blend where the distinct types of placements work together to enhance the overall composition, taking advantage of the strengths of each method.

This concept contrasts with the other classifications. For example, "Composite" generally refers to a design that features a combination of various components put together without necessarily integrating them in a cohesive manner. "Complex" often indicates a design with intricate details or multiple elements but does not specifically emphasize the blending of stem placements. "Hybrid," while it suggests a mix, usually refers more broadly to varieties or styles that result from crossbreeding or merging characteristics rather than the specific combination of stem placements in floral design.

Thus, "Integrated" is the most appropriate classification for describing a floral arrangement that combines multiple stem placement techniques harmoniously.