Which plant form is described as round or spherical in shape?

The rounded form of a plant is characterized by its nearly spherical shape, which can add a softer, more compact appearance to landscapes. This form is often used for aesthetic purposes in landscape design, helping to create balance and harmony within a planting scheme. Rounded plants tend to have a uniform outline and can vary greatly in size, but they share the common trait of being rounded, making them visually distinct in their arrangement.

Other forms, such as columnar or irregular, exhibit different characteristics. Columnar forms are tall and narrow, which can add verticality to designs, whereas irregular forms tend to have a more chaotic shape, lacking a defined structure. The rectangular form typically does not apply to plants and is more pertinent to architectural elements. Thus, the rounded form stands out as the correct choice when describing a plant that is round or spherical in shape.