Which of the following is NOT a recognized form of plant morphology?

Plant morphology refers to the study of the physical form and external structure of plants. Recognized forms in plant morphology typically describe specific shapes or growth habits that can be observed in different plant species.

Columnar describes a tall, narrow shape that can often be seen in certain coniferous trees or columnar varieties of other trees and plants. Round or globular refers to a more rounded form, commonly seen in shrubs and certain tree canopies. Pyramidal or conical describes a form that tapers toward the top, typically associated with certain evergreen trees like pines or firs.

Ornamental, while it pertains to plants that are grown for decorative purposes, does not describe a specific morphology. Instead, it encompasses a broad category that could include plants of various forms and does not provide a clear classification based on physical characteristics. Therefore, it is not considered a recognized form of plant morphology.

This distinction is important because understanding plant morphology aids in categorizing plants based on their physical traits, essential for various applications in horticulture, landscape design, and ecology.