The leaves of orange milkwort measure approximately 0.75 to 1.5 inches (1.9 to 3.8 cm) and are arranged along erect to ascending stems. They have a nearly succulent texture, offering a fleshy feel to the touch. The leaves are typically small, elliptical to lanceolate in shape, with a smooth margin and an overall green coloration. Vein patterns are subtle, contributing to the leaf’s slightly thickened appearance. These characteristics make the leaves distinct and readily identifiable.

The flowers of orange milkwort are small, vibrant yellow, and arranged in compact, head-like clusters. Each bloom comprises 3 tiny sepals, with one often slightly larger. Two larger, petal-like sepals stand out prominently. These striking flowers, which lack a noticeable scent, bloom from April to October, making them a prominent feature throughout spring and fall. The flowers are an essential aspect for identifying this species, given their unique structure and vivid color.

The stems of orange milkwort are slender, measuring approximately 4 to 6 inches (10 to 15 cm) in height. They are often branched in the upper half, forming a loose and open structure. The texture of the stems is smooth, and they exhibit a green coloration that may darken slightly with age. The stems have a somewhat flexible form, allowing for slight bending. Their branching pattern is a key identifying feature, with multiple offshoots creating a distinct appearance in the plant's upper regions.

The fruit of orange milkwort is a small, dry capsule that splits open when mature. Typically, it measures around 0.2 inches (5 mm) in length, showcasing a smooth to slight-textured surface. As it ripens, the fruit transforms from a greenish hue to brown, blending with the foliage from June to November. Notably, the capsule contains two tiny seeds that are black and shiny, each wrapped in an orange to red, fleshy structure called an aril, which aids in seed dispersal by attracting birds and other fauna.