The leaves of bush's Poppymallow are palmately divided into 5 to 7 lobes, giving them a hand-like shape. The blades vary from 1 to 3 inches (2.5 to 7.6 cm) in length and can grow up to 5 inches (12.7 cm) long. Lower stem leaves feature more divisions and are characterized by teeth-like indentations at the lobe tips. As they ascend, stem leaves become smaller with fewer lobes (3-5) and fewer indentations. They grow on long, hairy stalks, adding a textured feel.

The flowers of bush's Poppymallow are a captivating bright magenta color, featuring five wedge-shaped, overlapping petals that create a cup-like formation. The base of this cup is distinctly white, housing a central column of stamens. The flower is supported by five hairy, pointed green sepals, and three hairy green bracts, all of which are shorter than the petals. Blooming from early to late summer, these flowers are approximately 1.5-2 inches (4-5 cm) in diameter.

The stems of bush's Poppymallow are characterized by their green color and are covered in greenish white hairs. These stems are weakly erect, often showing a rambling and creeping growth habit. They do not root at the nodes, allowing the plant to spread through the garden without anchoring themselves at points along the stem. The structure is relatively slender, lacking substantial thickness, and may exhibit a somewhat flexible texture ideal for its sprawling nature.

The fruit of bush's Poppymallow is presented in the form of a seed head, which is distinctively arranged into a flat ring structure. Each section of this ring houses a seed capsule that encases a solitary, kidney-shaped seed. These seeds bear a deep, very dark brown to black hue, contributing to their conspicuous appearance. When mature, the seeds are known to drop in close proximity to the parent plant, as they are not adapted for wind dispersal. The precise measurements of the seeds are not provided, but their unique formation and coloring are significant for recognition.